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VERITAS Collaboration; A. U. Abeysekara; S. Archambault; A. Archer; W. Benbow; R. Bird; M. Buchovecky; J. H. Buckley; V. Bugaev; K. Byrum; M. Cerruti; X. Chen; L. Ciupik; W. Cui; H. J. Dickinson; J. D. Eisch; M. Errando; A. Falcone; Q. Feng; J. P. Finley; H. Fleischhack; L. Fortson; A. Furniss; G. H. Gillanders; S. Griffin; J. Grube; M. Hutten; N. Hakansson; D. Hanna; J. Holder; T. B. Humensky; C. A. Johnson; P. Kaaret; P. Kar; M. Kertzman; D. Kieda; M. Krause; F. Krennrich; S. Kumar; M. J. Lang; G. Maier; S. McArthur; A. McCann; K. Meagher; P. Moriarty; R. Mukherjee; T. Nguyen; D. Nieto; R. A. Ong; A. N. Otte; N. Park; V. Pelassa; M. Pohl; A. Popkow; E. Pueschel; J. Quinn; K. Ragan; P. T. Reynolds; G. T. Richards; E. Roache; C. Rulten; M. Santander; G. H. Sembroski; K. Shahinyan; D. Staszak; I. Telezhinsky; J. V. Tucci; J. Tyler; S. P. Wakely; O. M. Weiner; A. Weinstein; A. Wilhelm; D. A. Williams; Fermi-LAT Collaboration; :; S. Fegan; B. Giebels; D. Horan; A. Berdyugin; J. Kuan; E. Lindfors; K. Nilsson; A. Oksanen; H. Prokoph; R. Reinthal; L. Takalo; F. Zefi
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B2 1215+30 is a BL Lac-type blazar that was first detected at TeV energies by the MAGIC atmospheric Cherenkov telescopes, and subsequently confirmed by the VERITAS observatory with data collected between 2009 and 2012. In 2014 February 08, VERITAS detected a large-amplitude flare from B2 1215+30 during routine monitoring observations of the blazar 1ES 1218+304, located in the same field of view. The TeV flux reached 2.4 times the Crab Nebula flux with a variability timescale of < 3.6 h....
Topics: Astrophysics, High Energy Astrophysical Phenomena
Source: http://arxiv.org/abs/1701.01067
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VERITAS Collaboration; S. Archambault; A. Archer; W. Benbow; M. Buchovecky; V. Bugaev; M. Cerruti; M. P. Connolly; W. Cui; A. Falcone; M. Fernández Alonso; J. P. Finley; H. Fleischhack; L. Fortson; A. Furniss; S. Griffin; M. Hütten; O. Hervet; J. Holder; T. B. Humensky; C. A. Johnson; P. Kaaret; P. Kar; D. Kieda; M. Krause; F. Krennrich; M. J. Lang; T. T. Y. Lin; G. Maier; S. McArthur; P. Moriarty; D. Nieto; S. O'Brien; R. A. Ong; A. N. Otte; M. Pohl; A. Popkow; E. Pueschel; J. Quinn; K. Ragan; P. T. Reynolds; G. T. Richards; E. Roache; A. C. Rovero; I. Sadeh; K. Shahinyan; D. Staszak; I. Telezhinsky; J. Tyler; S. P. Wakely; A. Weinstein; T. Weisgarber; P. Wilcox; A. Wilhelm; D. A. Williams; B. Zitzer
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We present a search for magnetically broadened gamma-ray emission around active galactic nuclei (AGN), using VERITAS observations of seven hard-spectrum blazars. A cascade process occurs when multi-TeV gamma rays from AGN interact with extragalactic background light (EBL) photons to produce electron-positron pairs, which then interact with cosmic microwave background (CMB) photons via inverse-Compton scattering to produce gamma rays. Due to the deflection of the electron-positron pairs, a...
Topics: High Energy Astrophysical Phenomena, Astrophysics
Source: http://arxiv.org/abs/1701.00372
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E. Aliu; S. Archambault; A. Archer; T. Aune; A. Barnacka; M. Beilicke; W. Benbow; R. Bird; J. H. Buckley; V. Bugaev; K. Byrum; J. V Cardenzana; M. Cerruti; X. Chen; L. Ciupik; M. P. Connolly; W. Cui; H. J. Dickinson; J. Dumm; J. D. Eisch; M. Errando; A. Falcone; Q. Feng; J. P. Finley; H. Fleischhack; P. Fortin; L. Fortson; A. Furniss; G. H. Gillanders; S. Griffin; S. T. Griffiths; J. Grube; G. Gyuk; N. Hakansson; D. Hanna; J. Holder; T. B. Humensky; C. A. Johnson; P. Kaaret; P. Kar; M. Kertzman; D. Kieda; F. Krennrich; S. Kumar; M. J. Lang; M. Lyutikov; A. S Madhavan; G. Maier; S. McArthur; A. McCann; K. Meagher; J. Millis; P. Moriarty; R. Mukherjee; D. Nieto; A. O'Faolain de Bhroithe; R. A. Ong; A. N. Otte; N. Park; M. Pohl; A. Popkow; H. Prokoph; E. Pueschel; J. Quinn; K. Ragan; L. C. Reyes; P. T. Reynolds; G. T. Richards; E. Roache; M. Santander; G. H. Sembroski; K. Shahinyan; A. W. Smith; D. Staszak; I. Telezhinsky; J. V. Tucci; J. Tyler; A. Varlotta; S. Vincent; S. P. Wakely; A. Weinstein; D. A. Williams; A. Zajczyk; B. Zitzer
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We present the results of 71.6 hours of observations of the Geminga pulsar (PSR J0633+1746) with the VERITAS very-high-energy gamma-ray telescope array. Data taken with VERITAS between November 2007 and February 2013 were phase-folded using a Geminga pulsar timing solution derived from data recorded by the XMM-\emph{Newton} and \emph{Fermi}-LAT space telescopes. No significant pulsed emission above 100 GeV is observed, and we report upper limits at the 95% confidence level on the integral flux...
Topics: High Energy Astrophysical Phenomena, Astrophysics
Source: http://arxiv.org/abs/1412.4734
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E. Aliu; S. Archambault; T. Arlen; T. Aune; A. Barnacka; M. Beilicke; W. Benbow; K. Berger; R. Bird; A. Bouvier; J. H. Buckley; V. Bugaev; M. Cerruti; X. Chen; L. Ciupik; E. Collins-Hughes; M. P. Connolly; W. Cui; J. Dumm; J. D. Eisch; A. Falcone; S. Federici; Q. Feng; J. P. Finley; H. Fleischhack; P. Fortin; L. Fortson; A. Furniss; N. Galante; G. H. Gillanders; S. Griffin; S. T. Griffiths; J. Grube; G. Gyuk; N. Hakansson; D. Hanna; J. Holder; G. Hughes; T. B. Humensky; C. A. Johnson; P. Kaaret; P. Kar; M. Kertzman; Y. Khassen; D. Kieda; H. Krawczynski; F. Krennrich; M. J. Lang; A. S Madhavan; P. Majumdar; S. McArthur; A. McCann; K. Meagher; J. Millis; P. Moriarty; R. Mukherjee; T. Nelson; D. Nieto; A. O'Faolain de Bhroithe; R. A. Ong; A. N. Otte; N. Park; J. S. Perkins; M. Pohl; A. Popkow; H. Prokoph; J. Quinn; K. Ragan; J. Rajotte; L. C. Reyes; P. T. Reynolds; G. T. Richards; E. Roache; A. Sadun; M. Santander; G. H. Sembroski; K. Shahinyan; F. Sheidaei; A. W. Smith; D. Staszak; I. Telezhinsky; M. Theiling; J. Tyler; A. Varlotta; V. V. Vassiliev; S. Vincent; S. P. Wakely; T. C. Weekes; A. Weinstein; R. Welsing; A. Wilhelm; D. A. Williams; B. Zitzer; M. Böttcher; M. Fumagalli
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We summarize broadband observations of the TeV-emitting blazar 1ES 1959+650, including optical R-band observations by the robotic telescopes Super-LOTIS and iTelescope, UV observations by Swift UVOT, X-ray observations by the Swift X-ray Telescope (XRT), high-energy gamma-ray observations with the Fermi Large Area Telescope (LAT) and very-high-energy (VHE) gamma-ray observations by VERITAS above 315 GeV, all taken between 17 April 2012 and 1 June 2012 (MJD 56034 and 56079). The contemporaneous...
Topics: High Energy Astrophysical Phenomena, Astrophysics
Source: http://arxiv.org/abs/1412.1031
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Jun 30, 2018
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Jun 30, 2018
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E. Aliu; A. Archer; T. Aune; A. Barnacka; B. Behera; M. Beilicke; W. Benbow; K. Berger; R. Bird; J. H. Buckley; V. Bugaev; K. Byrum; J. V Cardenzana; M. Cerruti; X. Chen; L. Ciupik; M. P. Connolly; W. Cui; H. J. Dickinson; J. Dumm; J. D. Eisch; M. Errando; A. Falcone; S. Federici; Q. Feng; J. P. Finley; P. Fortin; L. Fortson; A. Furniss; N. Galante; G. H. Gillanders; S. Griffin; S. T. Griffiths; J. Grube; G. Gyuk; N. Håkansson; D. Hanna; J. Holder; G. Hughes; T. B. Humensky; C. A. Johnson; P. Kaaret; P. Kar M. Kertzman; Y. Khassen; D. Kieda; H. Krawczynski; F. Krennrich; S. Kumar; M. J. Lang; A. Madhavan; S. McArthur; A. McCann; K. Meagher; J. Millis; P. Moriarty; D. Nieto; A. O'Faoláin de Bhróithe; R. A. Ong; M. Orr; A. N. Otte; N. Park; J. S. Perkins; M. Pohl; A. Popkow; H. Prokoph; E. Pueschel; J. Quinn; K. Ragan; J. Rajotte; L. C. Reyes; P. T. Reynolds; G. T. Richards; E. Roache; G. H. Sembroski; K. Shahinyan; D. Staszak; I. Telezhinsky; J. V. Tucci; J. Tyler; A. Varlotta; V. V. Vassiliev; S. P. Wakely; A. Weinstein; R. Welsing; A. Wilhelm; D. A. Williams; B. Zitzer
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We present results from VERITAS observations of the BL Lac object PG 1553+113 spanning the years 2010, 2011, and 2012. The time-averaged spectrum, measured between 160 and 560\,GeV, is well described by a power law with a spectral index of $4.33 \pm 0.09$. The time-averaged integral flux above $200\,$GeV measured for this period was $(1.69 \pm 0.06) \times 10^{-11} \, \mathrm{ph} \, \mathrm{cm}^{-2} \, \mathrm{s}^{-1}$, corresponding to 6.9\% of the Crab Nebula flux. We also present the...
Topics: High Energy Astrophysical Phenomena, Astrophysics
Source: http://arxiv.org/abs/1411.1439
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Jun 30, 2018
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Jun 30, 2018
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F. Krennrich
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Indirect constraints on the intensity of the Extragalactic Background Light (EBL) were provided by recent studies of extragalactic sources emitting sub-TeV to multi-TeV photons. These constraints are provided thanks to the absorption of gamma rays by soft photons from the EBL (UV/optical/IR) via pair production by gamma - gamma interactions. This paper provides an overview of recent results that have led to substantially reduced uncertainties on the EBL intensity over a wide range of...
Topics: High Energy Astrophysical Phenomena, Astrophysics, Cosmology and Nongalactic Astrophysics
Source: http://arxiv.org/abs/1411.1445
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F. D'Ammando; M. Orienti; J. Finke; C. M. Raiteri; T. Hovatta; J. Larsson; W. Max-Moerbeck; J. Perkins; A. C. S. Readhead; J. L. Richards; M. Beilicke; W. Benbow; K. Berger; R. Bird; V. Bugaev; J. V. Cardenzana; M. Cerruti; X. Chen; L. Ciupik; H. J. Dickinson; J. D. Eisch; M. Errando; A. Falcone; J. P. Finley; H. Fleischhack; P. Fortin; L. Fortson; A. Furniss; L. Gerard; G. H. Gillanders; S. T. Griffiths; J. Grube; G. Gyuk; N. Hakansson; J. Holder; T. B. Humensky; P. Kar; M. Kertzman; Y. Khassen; D. Kieda; F. Krennrich; S. Kumar; M. J. Lang; G. Maier; A. McCann; K. Meagher; P. Moriarty; R. Mukherjee; D. Nieto; A. O' Faolain de Bhroithe; R. A. Ong; A. N. Otte; M. Pohl; A. Popkow; H. Prokoph; E. Pueschel; J. Quinn; K. Ragan; P. T. Reynolds; G. T. Richards; E. Roache; J. Rousselle; M. Santander; G. H. Sembroski; A. W. Smith; D. Staszak; I. Telezhinsky; J. V. Tucci; J. Tyler; A. Varlotta; V. V. Vassiliev; S. P. Wakely; A. Weinstein; R. Welsing; D. A. Williams; B. Zitzer
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We report on multifrequency observations performed during 2012 December-2013 August of the first narrow-line Seyfert 1 galaxy detected in gamma rays, PMN J0948+0022 ($z$ = 0.5846). A gamma-ray flare was observed by the Large Area Telescope on board Fermi during 2012 December-2013 January, reaching a daily peak flux in the 0.1-100 GeV energy range of (155 $\pm$ 31) $\times$10$^{-8}$ ph cm$^{-2}$ s$^{-1}$ on 2013 January 1, corresponding to an apparent isotropic luminosity of about...
Topics: High Energy Astrophysical Phenomena, Astrophysics
Source: http://arxiv.org/abs/1410.7144
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E. Aliu; T. Aune; A. Barnacka; M. Beilicke; W. Benbow; K. Berger; J. Biteau; J. H. Buckley; V. Bugaev; K. Byrum; J. V Cardenzana; M. Cerruti; X. Chen; L. Ciupik; V. Connaughton; W. Cui; H. J. Dickinson; J. D. Eisch; M. Errando; A. Falcone; S. Federici; Q. Feng; J. P. Finley; H. Fleischhack; P. Fortin; L. Fortson; A. Furniss; N. Galante; G. H. Gillanders; S. Griffin; S. T. Griffiths; J. Grube; G. Gyuk; N. Håkansson; D. Hanna; J. Holder; G. Hughes; T. B. Humensky; C. A. Johnson; P. Kaaret; P. Kar; M. Kertzman; Y. Khassen; D. Kieda; H. Krawczynski; F. Krennrich; M. J. Lang; A. S. Madhavan; G. Maier; S. McArthur; A. McCann; K. Meagher; J. Millis; P. Moriarty; R. Mukherjee; D. Nieto; A. O'Faoláin de Bhróithe; R. A. Ong; A. N. Otte; N. Park; M. Pohl; A. Popkow; H. Prokoph; E. Pueschel; J. Quinn; K. Ragan; J. Rajotte; L. C. Reyes; P. T. Reynolds; G. T. Richards; E. Roache; G. H. Sembroski; K. Shahinyan; A. W. Smith; D. Staszak; I. Telezhinsky; J. V. Tucci; J. Tyler; A. Varlotta; V. V. Vassiliev; S. Vincent; S. P. Wakely; O. M. Weiner; A. Weinstein; R. Welsing; A. Wilhelm; D. A. Williams; B. Zitzer; J. E. McEnery; J. S. Perkins; P. Veres; S. Zhu
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Prompt emission from the very fluent and nearby (z=0.34) gamma-ray burst GRB 130427A was detected by several orbiting telescopes and by ground-based, wide-field-of-view optical transient monitors. Apart from the intensity and proximity of this GRB, it is exceptional due to the extremely long-lived high-energy (100 MeV to 100 GeV) gamma-ray emission, which was detected by the Large Area Telescope on the Fermi Gamma-ray Space Telescope for ~70 ks after the initial burst. The persistent,...
Topics: High Energy Astrophysical Phenomena, Astrophysics
Source: http://arxiv.org/abs/1410.5367
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Jun 30, 2018
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Jun 30, 2018
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E. Aliu; S. Archambault; T. Aune; B. Behera; M. Beilicke; W. Benbow; K. Berger; R. Bird; J. H. Buckley; V. Bugaev; J. V Cardenzana; M. Cerruti; X. Chen; L. Ciupik; E. Collins-Hughes; M. P. Connolly; W. Cui; J. Dumm; V. V. Dwarkadas; M. Errando; A. Falcone; S. Federici; Q. Feng; J. P. Finley; H. Fleischhack; P. Fortin; L. Fortson; A. Furniss; N. Galante; D. Gall; G. H. Gillanders; S. Griffin; S. T. Griffiths; J. Grube; G. Gyuk; D. Hanna; J. Holder; G. Hughes; T. B. Humensky; P. Kaaret; M. Kertzman; Y. Khassen; D. Kieda; F. Krennrich; S. Kumar; M. J. Lang; A. S Madhavan; G. Maier; A. J. McCann; K. Meagher; J. Millis; P. Moriarty; R. Mukherjee; D. Nieto; A. O'Faolain de Bhroithe; R. A. Ong; A. N. Otte; D. Pandel; N. Park; M. Pohl; A. Popkow; H. Prokoph; J. Quinn; K. Ragan; J. Rajotte; G. Ratliff; L. C. Reyes; P. T. Reynolds; G. T. Richards; E. Roache; J. Rousselle; G. H. Sembroski; K. Shahinyan; F. Sheidaei; A. W. Smith; D. Staszak; I. Telezhinsky; K. Tsurusaki; J. V. Tucci; J. Tyler; A. Varlotta; V. V. Vassiliev; S. Vincent; S. P. Wakely; J. E. Ward; A. Weinstein; R. Welsing; A. Wilhelm
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We report on deep observations of the extended TeV gamma-ray source MGRO J1908+06 made with the VERITAS very high energy (VHE) gamma-ray observatory. Previously, the TeV emission has been attributed to the pulsar wind nebula (PWN) of the Fermi-LAT pulsar PSR J1907+0602. We detect MGRO J1908+06 at a significance level of 14 standard deviations (14 sigma) and measure a photon index of 2.20 +/- 0.10_stat +/- 0.20_sys. The TeV emission is extended, covering the region near PSR J1907+0602 and also...
Topics: High Energy Astrophysical Phenomena, Astrophysics
Source: http://arxiv.org/abs/1404.7185
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Jun 30, 2018
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S. Archambault; T. Aune; B. Behera; M. Beilicke; W. Benbow; K. Berger; R. Bird; J. Biteau; V. Bugaev; K. Byrum; J. V Cardenzana; F. de Palma; C. D. Dermer; S. W. Digel; L. Di Venere; P. S. Drell; C. Favuzzi; A. Franckowiak; P. Fusco; F. Gargano; D. Gasparrini; M. Cerruti; N. Giglietto; F. Giordano; M. Giroletti; I. A. Grenier; S. Guiriec; T. Jogler; M. Kuss; S. Larsson; L. Latronico; F. Longo; X. Chen; F. Loparco; P. Lubrano; G. M. Madejski; M. Mayer; M. N. Mazziotta; P. F. Michelson; T. Mizuno; M. E. Monzani; A. Morselli; S. Murgia; L. Ciupik; E. Nuss; T. Ohsugi; J. F. Ormes; J. S. Perkins; F. Piron; G. Pivato; S. Raino; M. Razzano; A. Reimer; O. Reimer; M. P. Connolly; S. Ritz; M. Schaal; C. Sgro; E. J. Siskind; P. Spinelli; H. Takahashi; L. Tibaldo; M. Tinivella; E. Troja; G. Vianello; W. Cui; M. Werner; M. Wood; J. Dumm; M. Errando; A. Falcone; S. Federici; Q. Feng; J. P. Finley; H. Fleischhack; L. Fortson; A. Furniss; N. Galante; G. H. Gillanders; S. Griffin; S. T. Griffiths; J. Grube; G. Gyuk; D. Hanna; J. Holder; G. Hughes; T. B. Humensky; C. A. Johnson; P. Kaaret; M. Kertzman; Y. Khassen; D. Kieda; H. Krawczynski; F. Krennrich; S. Kumar; M. J. Lang; A. S Madhavan; G. Maier; A. McCann; K. Meagher; P. Moriarty; R. Mukherjee; D. Nieto; A. O'Faolain de Bhroithe; R. A. Ong; A. N. Otte; N. Park; M. Pohl; A. Popkow; H. Prokoph; J. Quinn; K. Ragan; J. Rajotte; L. C. Reyes; P. T. Reynolds; G. T. Richards; E. Roache; G. H. Sembroski; K. Shahinyan; D. Staszak; I. Telezhinsky; J. V. Tucci; J. Tyler; A. Varlotta; V. V. Vassiliev; S. Vincent; S. P. Wakely; A. Weinstein; R. Welsing; A. Wilhelm; D. A. Williams; M. Ackermann; M. Ajello; A. Albert; L. Baldini; D. Bastieri; R. Bellazzini; E. Bissaldi; J. Bregeon; R. Buehler; S. Buson; G. A. Caliandro; R. A. Cameron; P. A. Caraveo; E. Cavazzuti; E. Charles; J. Chiang; S. Ciprini; R. Claus; S. Cutini; F. D'Ammando; A. de Angelis
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We present deep VERITAS observations of the blazar PKS 1424+240, along with contemporaneous Fermi Large Area Telescope, Swift X-ray Telescope and Swift UV Optical Telescope data between 2009 February 19 and 2013 June 8. This blazar resides at a redshift of $z\ge0.6035$, displaying a significantly attenuated gamma-ray flux above 100 GeV due to photon absorption via pair-production with the extragalactic background light. We present more than 100 hours of VERITAS observations from three years, a...
Topics: High Energy Astrophysical Phenomena, Astrophysics
Source: http://arxiv.org/abs/1403.4308
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Jun 30, 2018
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M. Demarteau; R. Lipton; H. Nicholson; I. Shipsey; D. Akerib; A. Albayrak-Yetkin; J. Alexander; J. Anderson; M. Artuso; D. Asner; R. Ball; J. Love; D. Lynn; D. MacFarlane; S. Magill; S. Majewski; J. Mans; J. Maricic; P. Marleau; A. Mazzacane; D. McKinsey; M. Battaglia; J. Mehl; A. Mestvirisvilli; S. Meyer; N. Mokhov; M. Moshe; A. Mukherjee; P. Murat; S. Nahn; M. Narain; P. Nadel-Turonski; C. Bebek; M. Newcomer; K. Nishimura; D. Nygren; E. Oberla; Y. Onel; M. Oreglia; J. Orrell; J. Paley; A. Para; S. Parker; J. Beene; V. Polychronakos; S. Pordes; P. Privitera; A. Prosser; M. Pyle; J. Raaf; E. Ramberg; R. Rameika; B. Rebel; J. Repond; Y. Benhammou; D. Reyna; L. Ristori; R. Rivera; A. Ronzhin; R. Rusack; J. Russ; A. Ryd; H. Sadrozinski; H. Sahoo; M. C. Sanchez; E. Bentefour; C. Sanzeni; S. Schnetzer; S. Seidel; A. Seiden; I. Schmidt; A. Shenai; T. Shutt; Y. Silver; W. Smith; D. Snowden-Ifft; M. Bergevin; A. Sonnenschein; D. Southwick; L. Spiegel; M. Stanitzki; S. Striganov; D. Su; R. Sumner; R. Svoboda; M. Sweany; R. Talaga; A. Bernstein; R. Tayloe; S. Tentindo; N. Terentiev; J. Thom-Levy; C. Thorn; J. Tiffenberg; W. Trischuk; R. Tschirhart; M. Turner; D. Underwood; B. Bilki; L. Uplegger; J. Urheim; M. Vagins; K. Van Bibber; G. Varner; R. Varner; J. Va'vra; H. Von der Lippe; R. Wagner; S. Wagner; E. Blucher; C. Weaverdyck; H. Wenzel; A. Weinstein; M. Wetstein; A. White; R. Wigman; P. Wilson; D. Winn; P. Winter; C. Woody; G. Bolla; L. Xia; J. Q. Xie; Z. Ye; M. F. Yeh; T. Yetkin; J. H. Yoo; J. Yu; J. M. Yu; S. Zeller; J. L. Zhang; D. Bortoletto; J. J. Zhu; B. Zhou; R. Y. Zhu; B. Zitzer; N. Bowden; G. Brooijmans; K. Byrum; B. Cabrera; G. Cancelo; J. Carlstrom; B. Casey; C. Chang; J. Chapman; C. H. Chen; I. Childres; D. Christian; M. Convery; W. Cooper J. Corso; J. Cumalat; P. Cushman; C. Da Via; S. Dazeley; P. Debbins; G. Deptuch; S. Dhawan; V. Di Benedetto; B. DiGiovene; Z. Djurcic; S. Dye; A. Elagin; J. Estrada; H. Evans; E. Etzion; J. Fast; C. Ferretti; P. Fisher; B. Fleming; K. Francis; P. Friedman; H. Frisch; M. Garcia-Sciveres; C. Gatto; G. Geronim; G. Gilchriese; S. Golwala; C. Grant; A. Grillo; E. Grünendahl; P. Gorham; L. Guan; G. Gutierrez; C. Haber; J. Hall; G. Haller; C. Hast; U. Heintz; T. Hemmick; D. G. Hitlin; C. Hogan; M. Hohlmann; E. Hoppe; L. Hsu; M. Huffer; K. Irwin; F. Izraelevitch; G. Jennings; M. Johnson; A. Jung; H. Kagan; C. Kenney; S. Kettell; R. Khanna; V. Khristenko; F. Krennrich; K. Kuehn; R. Kutschke; J. Learned; A. T. Lee; D. Levin; T. Liu; A. T. K. Liu; D. Lissauer
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These reports present the results of the 2013 Community Summer Study of the APS Division of Particles and Fields ("Snowmass 2013") on the future program of particle physics in the U.S. Chapter 8, on the Instrumentation Frontier, discusses the instrumentation needs of future experiments in the Energy, Intensity, and Cosmic Frontiers, promising new technologies for particle physics research, and issues of gathering resources for long-term research in this area.
Topics: Instrumentation and Detectors, Physics, High Energy Physics - Phenomenology, High Energy Physics -...
Source: http://arxiv.org/abs/1401.6116
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Jun 29, 2018
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IceCube Collaboration; M. G. Aartsen; K. Abraham; M. Ackermann; J. Adams; J. A. Aguilar; M. Ahlers; M. Ahrens; D. Altmann; K. Andeen; T. Anderson; J. G. Gonzalez; D. Grant; Z. Griffith; C. Haack; A. Haj Ismail; A. Hallgren; F. Halzen; E. Hansen; T. Hansmann; K. Hanson; I. Ansseau; D. Hebecker; D. Heereman; K. Helbing; R. Hellauer; S. Hickford; J. Hignight; G. C. Hill; K. D. Hoffman; R. Hoffmann; K. Holzapfel; G. Anton; K. Hoshina; F. Huang; M. Huber; K. Hultqvist; S. In; A. Ishihara; E. Jacobi; G. S. Japaridze; M. Jeong; K. Jero; M. Archinger; B. J. P. Jones; M. Jurkovic; A. Kappes; T. Karg; A. Karle; U. Katz; M. Kauer; A. Keivani; J. L. Kelley; A. Kheirandish; C. Arguelles; M. Kim; T. Kintscher; J. Kiryluk; T. Kittler; S. R. Klein; G. Kohnen; R. Koirala; H. Kolanoski; R. Konietz; L. Kopke; J. Auffenberg; C. Kopper; S. Kopper; D. J. Koskinen; M. Kowalski; K. Krings; M. Kroll; G. Kruckl; C. Kruger; J. Kunnen; S. Kunwar; S. Axani; N. Kurahashi; T. Kuwabara; M. Labare; J. L. Lanfranchi; M. J. Larson; F. Lauber; D. Lennarz; M. Lesiak-Bzdak; M. Leuermann; L. Lu; X. Bai; J. Lunemann; J. Madsen; G. Maggi; K. B. M. Mahn; S. Mancina; M. Mandelartz; R. Maruyama; K. Mase; R. Maunu; F. McNally; S. W. Barwick; K. Meagher; M. Medici; M. Meier; A. Meli; T. Menne; G. Merino; T. Meures; S. Miarecki; L. Mohrmann; T. Montaruli; V. Baum; M. Moulai; R. Nahnhauer; U. Naumann; G. Neer; H. Niederhausen; S. C. Nowicki; D. R. Nygren; A. Obertacke Pollmann; A. Olivas; A. O'Murchadha; R. Bay; T. Palczewski; H. Pandya; D. V. Pankova; P. Peiffer; O. Penek; J. A. Pepper; C. Perez de los Heros; D. Pieloth; E. Pinat; P. B. Price; J. J. Beatty; G. T. Przybylski; M. Quinnan; C. Raab; L. Radel; M. Rameez; K. Rawlins; R. Reimann; B. Relethford; M. Relich; E. Resconi; J. Becker-Tjus; W. Rhode; M. Richman; B. Riedel; S. Robertson; M. Rongen; C. Rott; T. Ruhe; D. Ryckbosch; D. Rysewyk; L. Sabbatini; K. -H. Becker; S. E. Sanchez-Herrera; A. Sandrock; J. Sandroos; S. Sarkar; K. Satalecka; P. Schlunder; T. Schmidt; S. Schoenen; S. Schoneberg; L. Schumacher; S. BenZvi; D. Seckel; S. Seunarine; D. Soldin; M. Song; G. M. Spiczak; C. Spiering; T. Stanev; A. Stasik; J. Stettner; A. Steuer; D. Berley; T. Stezelberger; R. G. Stokstad; A. Stossl; R. Strom; N. L. Strotjohann; G. W. Sullivan; M. Sutherland; H. Taavola; I. Taboada; J. Tatar; E. Bernardini; F. Tenholt; S. Ter-Antonyan; A. Terliuk; G. Tevsic; S. Tilav; P. A. Toale; M. N. Tobin; S. Toscano; D. Tosi; M. Tselengidou; A. Bernhard; A. Turcati; E. Unger; M. Usner; J. Vandenbroucke; N. van Eijndhoven; S. Vanheule; M. van Rossem; J. van Santen; J. Veenkamp; M. Vehring; D. Z. Besson; M. Voge; E. Vogel; M. Vraeghe; C. Walck; A. Wallace; M. Wallraff; N. Wandkowsky; Ch. Weaver; M. J. Weiss; C. Wendt; G. Binder; S. Westerhoff; B. J. Whelan; S. Wickmann; K. Wiebe; C. H. Wiebusch; L. Wille; D. R. Williams; L. Wills; M. Wolf; T. R. Wood; D. Bindig; E. Woolsey; K. Woschnagg; D. L. Xu; X. W. Xu; Y. Xu; J. P. Yanez; G. Yodh; S. Yoshida; M. Zoll MAGIC Collaboration; :; M. Bissok; M. L. Ahnen; S. Ansoldi; L. A. Antonelli; P. Antoranz; A. Babic; B. Banerjee; P. Bangale; U. Barres de Almeida; J. A. Barrio; J. Becerra Gonzalez; E. Blaufuss; W. Bednarek; E. Bernardini; A. Berti; B. Biasuzzi; A. Biland; O. Blanch; S. Bonnefoy; G. Bonnoli; F. Borracci; T. Bretz; S. Blot; S. Buson; A. Carosi; A. Chatterjee; R. Clavero; P. Colin; E. Colombo; J. L. Contreras; J. Cortina; S. Covino; P. Da Vela; C. Bohm; F. Dazzi; A. De Angelis; B. De Lotto; E. de Ona Wilhelmi; F. Di Pierro; M. Doert; A. Dominguez; D. Dominis Prester; D. Dorner; M. Doro; M. Borner; S. Einecke; D. Eisenacher Glawion; D. Elsaesser; M. Engelkemeier; V. Fallah Ramazani; A. Fernandez-Barral; D. Fidalgo; M. V. Fonseca; L. Font; K. Frantzen; F. Bos; C. Fruck; D. Galindo; R. J. Garcia Lopez; M. Garczarczyk; D. Garrido Terrats; M. Gaug; P. Giammaria; N. Godinovic; A. Gonzalez Munoz; D. Gora; D. Bose; D. Guberman; D. Hadasch; A. Hahn; Y. Hanabata; M. Hayashida; J. Herrera; J. Hose; D. Hrupec; G. Hughes; W. Idec; S. Boser; K. Kodani; Y. Konno; H. Kubo; J. Kushida; A. La Barbera; D. Lelas; E. Lindfors; S. Lombardi; F. Longo; M. Lopez; O. Botner; R. Lopez-Coto; P. Majumdar; M. Makariev; K. Mallot; G. Maneva; M. Manganaro; K. Mannheim; L. Maraschi; B. Marcote; M. Mariotti; J. Braun; M. Martinez; D. Mazin; U. Menzel; J. M. Miranda; R. Mirzoyan; A. Moralejo; E. Moretti; D. Nakajima; V. Neustroev; A. Niedzwiecki; L. Brayeur; M. Nievas Rosillo; K. Nilsson; K. Nishijima; K. Noda; L. Nogues; A. Overkemping; S. Paiano; J. Palacio; M. Palatiello; D. Paneque; H. -P. Bretz; R. Paoletti; J. M. Paredes; X. Paredes-Fortuny; G. Pedaletti; M. Peresano; L. Perri; M. Persic; J. Poutanen; P. G. Prada Moroni; E. Prandini; S. Bron; I. Puljak; I. Reichardt; W. Rhode; M. Ribo; J. Rico; J. Rodriguez Garcia; T. Saito; K. Satalecka; S. Schroeder; C. Schultz; A. Burgman; T. Schweizer; A. Sillanpaa; J. Sitarek; I. Snidaric; D. Sobczynska; A. Stamerra; T. Steinbring; M. Strzys; T. Suric; L. Takalo; T. Carver; F. Tavecchio; P. Temnikov; T. Terzic; D. Tescaro; M. Teshima; J. Thaele; D. F. Torres; T. Toyama; A. Treves; G. Vanzo; M. Casier; V. Verguilov; I. Vovk; J. E. Ward; M. Will; M. H. Wu; R. Zanin VERITAS Collaboration; :; A. U. Abeysekara; S. Archambault; A. Archer; E. Cheung; W. Benbow; R. Bird; E. Bourbeau; M. Buchovecky; V. Bugaev; K. Byrum; J. V Cardenzana; M. Cerruti; L. Ciupik; M. P. Connolly; D. Chirkin; W. Cui; H. J. Dickinson; J. Dumm; J. D. Eisch; M. Errando; A. Falcone; Q. Feng; J. P. Finley; H. Fleischhack; A. Flinders; A. Christov; L. Fortson; A. Furniss; G. H. Gillanders; S. Griffin; J. Grube; M. Hutten; N. Haakansson; O. Hervet; J. Holder; T. B. Humensky; K. Clark; C. A. Johnson; P. Kaaret; P. Kar; N. Kelley-Hoskins; M. Kertzman; D. Kieda; M. Krause; F. Krennrich; S. Kumar; M. J. Lang; L. Classen; G. Maier; S. McArthur; A. McCann; P. Moriarty; R. Mukherjee; T. Nguyen; D. Nieto; S. O'Brien; R. A. Ong; A. N. Otte; S. Coenders; N. Park; M. Pohl; A. Popkow; E. Pueschel; J. Quinn; K. Ragan; P. T. Reynolds; G. T. Richards; E. Roache; C. Rulten; G. H. Collin; I. Sadeh; M. Santander; G. H. Sembroski; K. Shahinyan; D. Staszak; I. Telezhinsky; J. V. Tucci; J. Tyler; S. P. Wakely; A. Weinstein; J. M. Conrad; P. Wilcox; A. Wilhelm; D. A. Williams; B. Zitzer; D. F. Cowen R. Cross; M. Day; J. P. A. M. de Andre; C. De Clercq; E. del Pino Rosendo; H. Dembinski; S. De Ridder; P. Desiati; K. D. de Vries; G. de Wasseige; M. de With; T. DeYoung; J. C. Diaz-Velez; V. di Lorenzo; H. Dujmovic; J. P. Dumm; M. Dunkman; B. Eberhardt; T. Ehrhardt; B. Eichmann; P. Eller; S. Euler; P. A. Evenson; S. Fahey; A. R. Fazely; J. Feintzeig; J. Felde; K. Filimonov; C. Finley; S. Flis; C. -C. Fosig; A. Franckowiak; R. Franke; E. Friedman; T. Fuchs; T. K. Gaisser; J. Gallagher; L. Gerhardt; K. Ghorbani; W. Giang; L. Gladstone; T. Glauch; T. Glusenkamp; A. Goldschmidt; G. Golup
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We describe and report the status of a neutrino-triggered program in IceCube that generates real-time alerts for gamma-ray follow-up observations by atmospheric-Cherenkov telescopes (MAGIC and VERITAS). While IceCube is capable of monitoring the whole sky continuously, high-energy gamma-ray telescopes have restricted fields of view and in general are unlikely to be observing a potential neutrino-flaring source at the time such neutrinos are recorded. The use of neutrino-triggered alerts thus...
Topics: Instrumentation and Methods for Astrophysics, Physics, Astrophysics, High Energy Astrophysical...
Source: http://arxiv.org/abs/1610.01814
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Jun 29, 2018
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Jun 29, 2018
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E. Aliu; S. Archambault; A. Archer; T. Arlen; T. Aune; A. Barnacka; B. Behera; M. Beilicke; W. Benbow; K. Berger; R. Bird; O. M. Weiner; A. Weinstein; R. Welsing; A. Wilhelm; D. A. Williams; B. Zitzer; M. G. Baring; J. Becerra Gónzalez; A. N. Cillis; D. Horan; A. Bouvier; D. Paneque; M. Böttcher; M. Buchovecky; J. H. Buckley; V. Bugaev; J. V Cardenzana; M. Cerruti; A. Cesarini; X. Chen; L. Ciupik; E. Collins-Hughes; M. P. Connolly; W. Cui; J. Dumm; J. D. Eisch; A. Falcone; S. Federici; Q. Feng; J. P. Finley; H. Fleischhack; P. Fortin; L. Fortson; A. Furniss; N. Galante; D. Gall; G. H. Gillanders; S. Griffin; S. T. Griffiths; J. Grube; G. Gyuk; M. Hütten; N. Håkansson; J. Holder; G. Hughes; T. B. Humensky; C. A. Johnson; P. Kaaret; P. Kar; N. Kelley-Hoskins; M. Kertzman; Y. Khassen; D. Kieda; M. Krause; H. Krawczynski; F. Krennrich; M. J. Lang; A. S Madhavan; G. Maier; S. McArthur; A. McCann; K. Meagher; J. Millis; P. Moriarty; R. Mukherjee; D. Nieto; A. O'Faoláin de Bhróithe; R. A. Ong; M. Orr; A. N. Otte; D. Pandel; N. Park; V. Pelassa; J. S. Perkins; A. Pichel; M. Pohl; A. Popkow; J. Quinn; K. Ragan; L. C. Reyes; P. T. Reynolds; E. Roache; J. Rousselle; A. C. Rovero; D. B. Saxon; G. H. Sembroski; K. Shahinyan; F. Sheidaei; C. Skole; A. W. Smith; D. Staszak; I. Telezhinsky; M. Theiling; N. W. Todd; J. V. Tucci; J. Tyler; A. Varlotta; V. V. Vassiliev; S. Vincent; S. P. Wakely
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The very high energy (VHE; E $>$ 100 GeV) blazar Markarian 501 was observed between April 17 and May 5 (MJD 54938--54956), 2009, as part of an extensive multi-wavelength campaign from radio to VHE. Strong VHE $\gamma$-ray activity was detected on May 1st with Whipple and VERITAS, when the flux (E $>$ 400 GeV) increased to 10 times the pre-flare baseline flux ($3.9{\times 10^{-11}}~{\rm ph~cm^{-2}~s^{-1}}$), reaching five times the flux of the Crab Nebula. This coincided with a decrease in...
Topics: Astrophysics, High Energy Astrophysical Phenomena
Source: http://arxiv.org/abs/1608.01569
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Jun 29, 2018
06/18
Jun 29, 2018
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VERITAS Collaboration; A. U. Abeysekara; S. Archambault; A. Archer; W. Benbow; R. Bird; J. Biteau; M. Buchovecky; J. H. Buckley; V. Bugaev; K. Byrum; J. V Cardenzana; M. Cerruti; X. Chen; J. L. Christiansen; L. Ciupik; M. P. Connolly; W. Cui; H. J. Dickinson; J. Dumm; J. D. Eisch; M. Errando; A. Falcone; Q. Feng; J. P. Finley; H. Fleischhack; A. Flinders; P. Fortin; L. Fortson; A. Furniss; G. H. Gillanders; S. Griffin; J. Grube; G. Gyuk; M. Hütten; D. Hanna; J. Holder; T. B. Humensky; C. A. Johnson; P. Kaaret; P. Kar; N. Kelley-Hoskins; M. Kertzman; D. Kieda; M. Krause; F. Krennrich; S. Kumar; M. J. Lang; G. Maier; S. McArthur; A. McCann; K. Meagher; P. Moriarty; R. Mukherjee; D. Nieto; S. O'Brien; A. O'Faoláin de Bhróithe; R. A. Ong; A. N. Otte; N. Park; V. Pelassa; A. Petrashyk; M. Pohl; A. Popkow; E. Pueschel; J. Quinn; K. Ragan; G. Ratliff; L. C. Reyes; P. T. Reynolds; G. T. Richards; E. Roache; C. Rulten; M. Santander; G. H. Sembroski; K. Shahinyan; A. W. Smith; D. Staszak; I. Telezhinsky; J. V. Tucci; J. Tyler; S. Vincent; S. P. Wakely; O. M. Weiner; A. Weinstein; A. Wilhelm; D. A. Williams; B. Zitzer
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We present results from multiwavelength observations of the BL Lacertae object 1ES 1741+196, including results in the very-high-energy $\gamma$-ray regime using the Very Energetic Radiation Imaging Telescope Array System (VERITAS). The VERITAS time-averaged spectrum, measured above 180 GeV, is well-modelled by a power law with a spectral index of $2.7\pm0.7_{\mathrm{stat}}\pm0.2_{\mathrm{syst}}$. The integral flux above 180 GeV is $(3.9\pm0.8_{\mathrm{stat}}\pm1.0_{\mathrm{syst}})\times...
Topics: Astrophysics, High Energy Astrophysical Phenomena
Source: http://arxiv.org/abs/1603.07286
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Jun 29, 2018
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Jun 29, 2018
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S. Archambault; A. Archer; W. Benbow; R. Bird; J. Biteau; M. Buchovecky; J. H. Buckley; V. Bugaev; K. Byrum; M. Cerruti; X. Chen; L. Ciupik; M. P. Connolly; W. Cui; J. D. Eisch; M. Errando; A. Falcone; Q. Feng; J. P. Finley; H. Fleischhack; P. Fortin; L. Fortson; A. Furniss; G. H. Gillanders; S. Griffin; J. Grube; G. Gyuk; M. Hütten; N. Hakansson; D. Hanna; J. Holder; T. B. Humensky; C. A. Johnson; P. Kaaret; P. Kar; N. Kelley-Hoskins; M. Kertzman; D. Kieda; M. Krause; F. Krennrich; S. Kumar; M. J. Lang; G. Maier; S. McArthur; A. McCann; K. Meagher; P. Moriarty; R. Mukherjee; T. Nguyen; D. Nieto; A. O'Faoláin De Bhróithe; R. A. Ong; A. N. Otte; N. Park; J. S. Perkins; A. Pichel; M. Pohl; A. Popkow; E. Pueschel; J. Quinn; K. Ragan; P. T. Reynolds; G. T. Richards; E. Roache; A. C. Rovero; M. Santander; G. H. Sembroski; K. Shahinyan; A. W. Smith; D. Staszak; I. Telezhinsky; J. V. Tucci; J. Tyler; S. Vincent; S. P. Wakely; O. M. Weiner; A. Weinstein; D. A. Williams; B. Zitzer; M. Fumagalli; J. X. Prochaska
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Between the beginning of its full-scale scientific operations in 2007 and 2012, the VERITAS Cherenkov telescope array observed more than 130 blazars; of these, 26 were detected as very-high-energy (VHE; E>100 GeV) {\gamma}-ray sources. In this work, we present the analysis results of a sample of 114 undetected objects. The observations constitute a total live-time of ~570 hours. The sample includes several unidentified Fermi-Large Area Telescope (LAT) sources (located at high Galactic...
Topics: Astrophysics, High Energy Astrophysical Phenomena
Source: http://arxiv.org/abs/1603.02410
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Jun 29, 2018
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Jun 29, 2018
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A. Archer; W. Benbow; R. Bird; M. Buchovecky; J. H. Buckley; V. Bugaev; K. Byrum; J. V Cardenzana; M. Cerruti; X. Chen; L. Ciupik; E. Collins-Hughes; M. P. Connolly; J. D. Eisch; A. Falcone; Q. Feng; J. P. Finley; H. Fleischhack; A. Flinders; L. Fortson; A. Furniss; G. H. Gillanders; S. Griffin; J. Grube; G. Gyuk; N. Hakansson; D. Hanna; J. Holder; T. B. Humensky; M. Hutten; C. A. Johnson; P. Kaaret; P. Kar; N. Kelley-Hoskins; M. Kertzman; D. Kieda; M. Krause; F. Krennrich; S. Kumar; M. J. Lang; S. McArthur; A. McCann; K. Meagher; J. Millis; P. Moriarty; R. Mukherjee; D. Nieto; R. A. Ong; N. Park; V. Pelassa; M. Pohl; A. Popkow; E. Pueschel; J. Quinn; K. Ragan; G. Ratliff; P. T. Reynolds; G. T. Richards; E. Roache; J. Rousselle; M. Santander; G. H. Sembroski; K. Shahinyan; A. W. Smith; D. Staszak; I. Telezhinsky; J. V. Tucci; J. Tyler; V. V. Vassiliev; S. P. Wakely; O. M. Weiner; A. Weinstein; A. Wilhelm; D. A. Williams; B. Zitzer; F. Yusef-Zadeh
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The Galactic Center Ridge has been observed extensively in the past by both GeV and TeV gamma-ray instruments revealing a wealth of structure, including a diffuse component as well as the point sources G0.9+0.1 (a composite supernova remnant) and Sgr A* (believed to be associated with the supermassive black hole located at the center of our Galaxy). Previous very high energy (VHE) gamma-ray observations with the H.E.S.S. experiment have also detected an extended TeV gamma-ray component along...
Topics: Astrophysics, High Energy Astrophysical Phenomena
Source: http://arxiv.org/abs/1602.08522
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Jun 29, 2018
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Jun 29, 2018
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A. U. Abeysekara; S. Archambault; A. Archer; W. Benbow; R. Bird; M. Buchovecky; J. H. Buckley; K. Byrum; J. V Cardenzana; M. Cerruti; X. Chen; J. L. Christiansen; L. Ciupik; W. Cui; H. J. Dickinson; J. D. Eisch; M. Errando; A. Falcone; D. J. Fegan; Q. Feng; J. P. Finley; H. Fleischhack; P. Fortin; L. Fortson; A. Furniss; G. H. Gillanders; S. Griffin; J. Grube; G. Gyuk; M. Huetten; N. Hakansson; D. Hanna; J. Holder; T. B. Humensky; C. A. Johnson; P. Kaaret; P. Kar; N. Kelley-Hoskins; M. Kertzman; D. Kieda; M. Krause; F. Krennrich; S. Kumar; M. J. Lang; T. T. Y. Lin; G. Maier; S. McArthur; A. McCann; K. Meagher; P. Moriarty; R. Mukherjee; D. Nieto; S. O'Brien; A. O'Faolain de Bhroithe; R. A. Ong; A. N. Otte; N. Park; J. S. Perkins; A. Petrashyk; M. Pohl; A. Popkow; E. Pueschel; J. Quinn; K. Ragan; G. Ratliff; P. T. Reynolds; G. T. Richards; E. Roache; M. Santander; G. H. Sembroski; K. Shahinyan; D. Staszak; I. Telezhinsky; J. V. Tucci; J. Tyler; S. Vincent; S. P. Wakely; O. M. Weiner; A. Weinstein; D. A. Williams; B. Zitzer
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The F-type star KIC 8462852 has recently been identified as an exceptional target for SETI (search for extraterrestrial intelligence) observations. We describe an analysis methodology for optical SETI, which we have used to analyse nine hours of serendipitous archival observations of KIC 8462852 made with the VERITAS gamma-ray observatory between 2009 and 2015. No evidence of pulsed optical beacons, above a pulse intensity at the Earth of approximately 1 photon per m^2, is found. We also...
Topics: Astrophysics, High Energy Astrophysical Phenomena, Solar and Stellar Astrophysics, Instrumentation...
Source: http://arxiv.org/abs/1602.00987
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2.0
Jun 29, 2018
06/18
Jun 29, 2018
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VERITAS Collaboration; S. Archambault; A. Archer; T. Aune; A. Barnacka; W. Benbow; R. Bird; M. Buchovecky; J. H. Buckley; V. Bugaev; K. Byrum; J. V. Cardenzana; M. Cerruti; X. Chen; L. Ciupik; E. Collins-Hughes; M. P. Connolly; W. Cui; H. J. Dickinson; J. Dumm; J. D. Eisch; A. Falcone; Q. Feng; J. P. Finley; H. Fleischhack; A. Flinders; P. Fortin; L. Fortson; A. Furniss; G. H. Gillanders; S. Griffin; J. Grube; G. Gyuk; M. Huetten; N. Hakansson; D. Hanna; J. Holder; T. B. Humensky; C. A. Johnson; P. Kaaret; P. Kar; N. Kelley-Hoskins; M. Kertzman; Y. Khassen; D. Kieda; M. Krause; F. Krennrich; S. Kumar; M. J. Lang; G. Maier; S. McArthur; A. McCann; K. Meagher; J. Millis; P. Moriarty; R. Mukherjee; D. Nieto; S. O'Brien; A. O'Faolain de Bhroithe; R. A. Ong; A. N. Otte; D. Pandel; N. Park; V. Pelassa; M. Pohl; A. Popkow; E. Pueschel; J. Quinn; K. Ragan; P. T. Reynolds; G. T. Richards; E. Roache; J. Rousselle; C. Rulten; M. Santander; G. H. Sembroski; K. Shahinyan; A. W. Smith; D. Staszak; I. Telezhinsky; J. V. Tucci; J. Tyler; S. Vincent; S. P. Wakely; O. M. Weiner; A. Weinstein; A. Wilhelm; D. A. Williams; B. Zitzer
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The TeV binary system LS I +61$^\circ$ 303 is known for its regular, non-thermal emission pattern which traces the orbital period of the compact object in its 26.5 day orbit around its B0 Ve star companion. The system typically presents elevated TeV emission around apastron passage with flux levels between 5% and 15% of the steady flux from the Crab Nebula (> 300 GeV). In this article, VERITAS observations of LS I +61$^\circ$ 303 taken in late 2014 are presented, during which bright TeV...
Topics: Astrophysics, High Energy Astrophysical Phenomena
Source: http://arxiv.org/abs/1601.01812
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Jun 28, 2018
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Jun 28, 2018
by
A. U. Abeysekara; S. Archambault; A. Archer; T. Aune; A. Barnacka; W. Benbow; R. Bird; J. Biteau; J. H. Buckley; V. Bugaev; J. V Cardenzana; A. C. S. Readhead; G. M. Madejski; S. G. Djorgovski; A. J. Drake; M. J. Graham; A. Mahabal; M. Cerruti; X. Chen; J. L. Christiansen; L. Ciupik; M. P. Connolly; P. Coppi; W. Cui; H. J. Dickinson; J. Dumm; J. D. Eisch; M. Errando; A. Falcone; Q. Feng; J. P. Finley; H. Fleischhack; A. Flinders; P. Fortin; L. Fortson; A. Furniss; G. H. Gillanders; S. Griffin; J. Grube; G. Gyuk; M. Hütten; N. Håkansson; D. Hanna; J. Holder; T. B. Humensky; C. A. Johnson; P. Kaaret; P. Kar; N. Kelley-Hoskins; Y. Khassen; D. Kieda; M. Krause; F. Krennrich; S. Kumar; M. J. Lang; G. Maier; S. McArthur; A. McCann; K. Meagher; P. Moriarty; R. Mukherjee; D. Nieto; A. O'Faoláin de Bhróithe; R. A. Ong; A. N. Otte; N. Park; J. S. Perkins; A. Petrashyk; M. Pohl; A. Popkow; E. Pueschel; J. Quinn; K. Ragan; G. Ratliff; P. T. Reynolds; G. T. Richards; E. Roache; J. Rousselle; M. Santander; G. H. Sembroski; K. Shahinyan; A. W. Smith; D. Staszak; I. Telezhinsky; N. W. Todd; J. V. Tucci; J. Tyler; V. V. Vassiliev; S. Vincent; S. P. Wakely; O. M. Weiner; A. Weinstein; A. Wilhelm; D. A. Williams; B. Zitzer; P. S. Smith; T. W. -S. Holoien; J. L. Prieto; C. S. Kochanek; K. Z. Stanek; B. Shappee; T. Hovatta; W. Max-Moerbeck; T. J. Pearson; R. A. Reeves; J. L. Richards
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eye 2
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Outbursts from gamma-ray quasars provide insights on the relativistic jets of active galactic nuclei and constraints on the diffuse radiation fields that fill the Universe. The detection of significant emission above 100 GeV from a distant quasar would show that some of the radiated gamma rays escape pair-production interactions with low-energy photons, be it the extragalactic background light (EBL), or the radiation near the supermassive black hole lying at the jet's base. VERITAS detected...
Topics: Astrophysics, Cosmology and Nongalactic Astrophysics, High Energy Astrophysical Phenomena
Source: http://arxiv.org/abs/1512.04434
3
3.0
Jun 28, 2018
06/18
Jun 28, 2018
by
D. Staszak; A. U. Abeysekara; S. Archambault; A. Archer; A. Barnacka; W. Benbow; R. Bird; J. Biteau; M. Buchovecky; J. H. Buckley; V. Bugaev; K. Byrum; J. V Cardenzana; M. Cerruti; X. Chen; J. L. Christiansen; L. Ciupik; E. Collins-Hughes; M. P. Connolly; P. Coppi; W. Cui; V. V. Dwarkadas; J. D. Eisch; M. Errando; A. Falcone; Q. Feng; M. Fernandez Alonso; J. P. Finley; H. Fleischhack; A. Flinders; P. Fortin; L. Fortson; A. Furniss; G. H. Gillanders; S. Griffin; S. T. Griffiths; G. Gyuk; M. Hütten; D. Hanna; J. Holder; T. B. Humensky; C. A. Johnson; P. Kaaret; P. Kar; M. Kertzman; Y. Khassen; D. Kieda; M. Krause; F. Krennrich; S. Kumar; M. J. Lang; G. Maier; S. McArthur; A. McCann; K. Meagher; P. Moriarty; R. Mukherjee; T. Nguyen; D. Nieto; A. O'Faoláin de Bhróithe; R. A. Ong; A. N. Otte; D. Pandel; N. Park; V. Pelassa; J. S. Perkins; M. Pohl; A. Popkow; E. Pueschel; J. Quinn; K. Ragan; P. T. Reynolds; G. T. Richards; E. Roache; A. C. Rovero; M. Santander; S. Schlenstedt; G. H. Sembroski; K. Shahinyan; A. W. Smith; I. Telezhinsky; J. V. Tucci; J. Tyler; V. V. Vassiliev; S. Vincent; S. P. Wakely; O. M. Weiner; A. Weinstein; A. Wilhelm; D. A. Williams; B. Zitzer
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eye 3
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The Very Energetic Radiation Imaging Telescope Array System (VERITAS) is a ground-based array located at the Fred Lawrence Whipple Observatory in southern Arizona and is one of the world's most sensitive gamma-ray instruments at energies of 85 GeV to $>$30 TeV. VERITAS has a wide scientific reach that includes the study of extragalactic and Galactic objects as well as the search for astrophysical signatures of dark matter and the measurement of cosmic rays. In this paper, we will summarize...
Topics: Astrophysics, High Energy Astrophysical Phenomena
Source: http://arxiv.org/abs/1510.01269
8
8.0
Jun 28, 2018
06/18
Jun 28, 2018
by
A. Furniss; K. Noda; S. Boggs; J. Chiang; F. Christensen; W. Craig; P . Giommi; C. Hailey; F. Harisson; G. Madejski; K. Nalewajko; K. Mannheim; L. Maraschi; B. Marcote; M. Mariotti; M. Martinez; D. Mazin; U. Menzel; J. M. Miranda; R. Mirzoyan; A. Moralejo; M. Perri; D. Nakajima; V. Neustroev; A. Niedzwiecki; M. Nievas Rosillo; K. Nilsson; K. Nishijima; R. Orito; A. Overkemping; S. Paiano; J. Palacio; D. Stern; M. Palatiello; D. Paneque; R. Paoletti; J. M. Paredes; X. Paredes-Fortuny; M. Persic; J. Poutanen; P. G. Prada Moroni; E. Prandini; I. Puljak; M. Urry; R. Reinthal; W. Rhode; M. Ribo; J. Rico; J. Rodriguez Garcia; T. Saito; K. Saito; K. Satalecka; V. Scapin; C. Schultz; F. Verrecchia; T. Schweizer; S. N. Shore; A. Sillanpaa; J. Sitarek; I. Snidaric; D. Sobczynska; A. Stamerra; T. Steinbring; M. Strzys; L. Takalo; W. Zhang; H. Takami; F. Tavecchio; P. Temnikov; T. Terzic; D. Tescaro; M. Teshima; J. Thaele; D. F. Torres; T. Toyama; A. Treves; M. L. Ahnen; V. Verguilov; I. Vovk; M. Will; R. Zanin; A. Archer; W. Benbow; R. Bird; J. Biteau; V. Bugaev; J. V Cardenzana; S. Ansoldi; M. Cerruti; X. Chen; L. Ciupik; M. P. Connolly; W. Cui; H. J. Dickinson; J. Dumm; J. D. Eisch; A. Falcone; Q. Feng; L. A. Antonelli; J. P. Finley; H. Fleischhack; P. Fortin; L. Fortson; L. Gerard; G. H. Gillanders; S. Griffin; S. T. Griffiths; J. Grube; G. Gyuk; P. Antoranz; N. Haakansson; J. Holder; T. B. Humensky; C. A. Johnson; P. Kaaret; M. Kertzman; D. Kieda; M. Krause; F. Krennrich; M. J. Lang; A. Babic; T. T. Y. Lin; G. Maier; S. McArthur; A. McCann; K. Meagher; P. Moriarty; R. Mukherjee; D. Nieto; A. O'Faolain de Bhroithe; R. A. Ong; B. Banerjee; N. Park; D. Petry; M. Pohl; A. Popkow; K. Ragan; G. Ratliff; L. C. Reyes; P. T. Reynolds; G. T. Richards; E. Roache; P. Bangale; M. Santander; G. H. Sembroski; K. Shahinyan; D. Staszak; I. Telezhinsky; J. V. Tucci; J. Tyler; V. V. Vassiliev; S. P. Wakely; O. M. Weiner; U. Barres de Almeida; A. Weinstein; A. Wilhelm; D. A. Williams; B. Zitzer; O. Vince L. Fuhrmann; E. Angelakis; V. Karamanavis; I. Myserlis; T. P. Krichbaum; J. A. Zensus; J. A. Barrio; H. Ungerechts; A. Sievers; R. Bachev; M. Bottcher; W. P. Chen; G. Damljanovic; C. Eswaraiah; T. Guver; T. Hovatta; Z. Hughes; J. Becerra Gonzalez; S. . I. Ibryamov; M. D. Joner; B. Jordan; S. G. Jorstad; M. Joshi; J. Kataoka; O. M. Kurtanidze; S. O. Kurtanidze; A. Lahteenmaki; G. Latev; W. Bednarek; H. C. Lin; V. M. Larionov; A. A. Mokrushina; D. A. Morozova; M. G. Nikolashvili; C. M. Raiteri; V. Ramakrishnan; A. C. R. Readhead; A. C. Sadun; L. A. Sigua; E. Bernardini; E. H. Semkov; A. Strigachev; J. Tammi; M. Tornikoski; Y. V. Troitskaya I. S. Troitsky; M. Villata; B. Biasuzzi; A. Biland; O. Blanch; S. Bonnefoy; G. Bonnoli; F. Borracci; T. Bretz; E. Carmona; A. Carosi; A. Chatterjee; R. Clavero; P. Colin; E. Colombo; J. L. Contreras; J. Cortina; S. Covino; P. Da Vela; F. Dazzi; A. De Angelis; G. De Caneva; B. De Lotto; E. de Ona Wilhelmi; C. Delgado Mendez; F. Di Pierro; D. Dominis Prester; D. Dorner; M. Doro; S. Einecke; D. Eisenacher Glawion; D. Elsaesser; A. Fernandez-Barral; D. Fidalgo; M. V. Fonseca; L. Font; K. Frantzen; C. Fruck; D. Galindo; R. J. Garcia Lopez; M. Garczarczyk; D. Garrido Terrats; M. Gaug; P. Giammaria; N. Godinovic; A. Gonzalez Munoz; D. Guberman; Y. Hanabata; M. Hayashida; J. Herrera; J. Hose; D. Hrupec; G. Hughes; W. Idec; H. Kellermann; K. Kodani; Y. Konno; H. Kubo; J. Kushida; A. La Barbera; D. Lelas; N. Lewandowska; E. Lindfors; S. Lombardi; F. Longo; M. Lopez; R. Lopez-Coto; A. Lopez-Oramas; E. Lorenz; P. Majumdar; M. Makariev; K. Mallot; G. Maneva; M. Manganaro
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eye 8
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We report on simultaneous broadband observations of the TeV-emitting blazar Markarian 501 between 1 April and 10 August 2013, including the first detailed characterization of the synchrotron peak with Swift and NuSTAR. During the campaign, the nearby BL Lac object was observed in both a quiescent and an elevated state. The broadband campaign includes observations with NuSTAR, MAGIC, VERITAS, the Fermi Large Area Telescope (LAT), Swift X-ray Telescope and UV Optical Telescope, various...
Topics: High Energy Astrophysical Phenomena, Astrophysics
Source: http://arxiv.org/abs/1509.04936
12
12
Jun 28, 2018
06/18
Jun 28, 2018
by
S. Archambault; A. Archer; M. Beilicke; W. Benbow; R. Bird; J. Biteau; A. Bouvier; V. Bugaev; J. V Cardenzana; M. Cerruti; X. Chen; L. Ciupik; M. P. Connolly; W. Cui; H. J. Dickinson; J. Dumm; J. D. Eisch; M. Errando; A. Falcone; Q. Feng; J. P. Finley; H. Fleischhack; P. Fortin; L. Fortson; A. Furniss; G. H. Gillanders; S. Griffin; S. T. Griffiths; J. Grube; G. Gyuk; N. Håkansson; D. Hanna; J. Holder; T. B. Humensky; C. A. Johnson; P. Kaaret; P. Kar; M. Kertzman; Y. Khassen; D. Kieda; M. Krause; F. Krennrich; S. Kumar; M. J. Lang; G. Maier; S. McArthur; A. McCann; K. Meagher; J. Millis; P. Moriarty; R. Mukherjee; D. Nieto; A. O'Faoláin de Bhróithe; R. A. Ong; A. N. Otte; N. Park; M. Pohl; A. Popkow; H. Prokoph; E. Pueschel; J. Quinn; K. Ragan; L. C. Reyes; P. T. Reynolds; G. T. Richards; E. Roache; M. Santander; G. H. Sembroski; K. Shahinyan; A. W. Smith; D. Staszak; I. Telezhinsky; J. V. Tucci; J. Tyler; A. Varlotta; S. Vincent; S. P. Wakely; A. Weinstein; R. Welsing; A. Wilhelm; D. A. Williams; B. Zitzer; Z. D. Hughes
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eye 12
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During moonlit nights, observations with ground-based Cherenkov telescopes at very high energies (VHE, $E>100$ GeV) are constrained since the photomultiplier tubes (PMTs) in the telescope camera are extremely sensitive to the background moonlight. Observations with the VERITAS telescopes in the standard configuration are performed only with a moon illumination less than 35$\%$ of full moon. Since 2012, the VERITAS collaboration has implemented a new observing mode under bright moonlight, by...
Topics: High Energy Astrophysical Phenomena, Astrophysics
Source: http://arxiv.org/abs/1506.06246
8
8.0
Jun 27, 2018
06/18
Jun 27, 2018
by
I. Anghel; J. F. Beacom; M. Bergevin; C. Blanco; E. Catano-Mur; F. Di Lodovico; A. Elagin; H. Frisch; J. Griskevich; R. Hill; G. Jocher; T. Katori; F. Krennrich; J. Learned; M. Malek; R. Northrop; C. Pilcher; E. Ramberg; J. Repond; R. Sacco; M. C. Sanchez; M. Smy; H. Sobel; R. Svoboda; S. M. Usman; M. Vagins; G. Varner; R. Wagner; A. Weinstein; M. Wetstein; L. Winslow; L. Xia; M. Yeh
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eye 8
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Neutron tagging in Gadolinium-doped water may play a significant role in reducing backgrounds from atmospheric neutrinos in next generation proton-decay searches using megaton-scale Water Cherenkov detectors. Similar techniques might also be useful in the detection of supernova neutrinos. Accurate determination of neutron tagging efficiencies will require a detailed understanding of the number of neutrons produced by neutrino interactions in water as a function of momentum transferred. We...
Topics: Instrumentation and Detectors, High Energy Physics - Experiment, Physics
Source: http://arxiv.org/abs/1504.01480
9
9.0
Jun 26, 2018
06/18
Jun 26, 2018
by
MAGIC Collaboration; J. Aleksić; S. Ansoldi; L. A. Antonelli; P. Antoranz; A. Babic; P. Bangale; U. Barres de Almeida; J. A. Barrio; J. Becerra González; W. Bednarek; A. Overkemping; S. Paiano; M. Palatiello; D. Paneque; R. Paoletti; J. M. Paredes; X. Paredes-Fortuny; S. Partini; M. Persic; F. Prada; K. Berger; P. G. Prada Moroni; E. Prandini; S. Preziuso; I. Puljak; R. Reinthal; W. Rhode; M. Ribó; J. Rico; J. Rodriguez Garcia; S. Rügamer; E. Bernardini; A. Saggion; K. Saito; M. Salvati; K. Satalecka; V. Scalzotto; V. Scapin; C. Schultz; T. Schweizer; S. N. Shore; A. Sillanpää; A. Biland; J. Sitarek; I. Snidaric; D. Sobczynska; F. Spanier; V. Stamatescu; A. Stamerra; T. Steinbring; J. Storz; S. Sun; T. Surić; O. Blanch; L. Takalo; F. Tavecchio; P. Temnikov; T. Terzić; D. Tescaro; M. Teshima; J. Thaele; O. Tibolla; D. F. Torres; T. Toyama; R. K. Bock; A. Treves; M. Uellenbeck; P. Vogler; R. M. Wagner; F. Zandanel; R. Zanin; VERITAS collaboration; :; S. Archambault; B. Behera; S. Bonnefoy; M. Beilicke; W. Benbow; R. Bird; J. H. Buckley; V. Bugaev; M. Cerruti; X. Chen; L. Ciupik; E. Collins-Hughes; W. Cui; G. Bonnoli; J. Dumm; J. D. Eisch; A. Falcone; S. Federici; Q. Feng; J. P. Finley; H. Fleischhack; P. Fortin; L. Fortson; A. Furniss; F. Borracci; S. Griffin; S. T. Griffiths; J. Grube; G. Gyuk; D. Hanna; J. Holder; G. Hughes; T. B. Humensky; C. A. Johnson; P. Kaaret; T. Bretz; M. Kertzman; Y. Khassen; D. Kieda; H. Krawczynski; F. Krennrich; S. Kumar; M. J. Lang; G. Maier; S. McArthur; K. Meagher; E. Carmona; P. Moriarty; R. Mukherjee; R. A. Ong; A. N. Otte; N. Park; A. Pichel; M. Pohl; A. Popkow; H. Prokoph; J. Quinn; A. Carosi; K. Ragan; J. Rajotte; P. T. Reynolds; G. T. Richards; E. Roache; A. C. Rovero; G. H. Sembroski; K. Shahinyan; D. Staszak; I. Telezhinsky; D. Carreto Fidalgo; M. Theiling; J. V. Tucci; J. Tyler; A. Varlotta; S. P. Wakely; T. C. Weekes; A. Weinstein; R. Welsing; A. Wilhelm; D. A. Williams; P. Colin; B. Zitzer; External collaborators; :; M. Villata; C. Raiteri; H. D. Aller; M. F. Aller; W. P. Chen; B. Jordan; E. Koptelova; E. Colombo; O. M. Kurtanidze; A. Lähteenmäki; B. McBreen; V. M. Larionov; C. S. Lin; M. G. Nikolashvili; E. Angelakis; M. Capalbi; A. Carrami\ nana; L. Carrasco; J. L. Contreras; P. Cassaro; A. Cesarini; L. Fuhrmann; M. Giroletti; T. Hovatta; T. P. Krichbaum; H. A. Krimm; W. Max-Moerbeck; J. W. Moody; G. Maccaferri; J. Cortina; Y. Mori; I. Nestoras; A. Orlati; C. Pace; R. Pearson; M. Perri; A. C. S. Readhead; J. L. Richards; A. C. Sadun; T. Sakamoto; S. Covino; J. Tammi; M. Tornikoski; Y. Yatsu; A. Zook; P. Da Vela; F. Dazzi; A. De Angelis; G. De Caneva; B. De Lotto; C. Delgado Mendez; M. Doert; A. Domínguez; D. Dominis Prester; D. Dorner; M. Doro; S. Einecke; D. Eisenacher; D. Elsaesser; E. Farina; D. Ferenc; M. V. Fonseca; L. Font; K. Frantzen; C. Fruck; R. J. García López; M. Garczarczyk; D. Garrido Terrats; M. Gaug; G. Giavitto; N. Godinović; A. González Mu\ noz; S. R. Gozzini; A. Hadamek; D. Hadasch; A. Herrero; D. Hildebrand; J. Hose; D. Hrupec; W. Idec; V. Kadenius; H. Kellermann; M. L. Knoetig; J. Krause; J. Kushida; A. La Barbera; D. Lelas; N. Lewandowska; E. Lindfors; F. Longo; S. Lombardi; M. López; R. López-Coto; A. López-Oramas; E. Lorenz; I. Lozano; M. Makariev; K. Mallot; G. Maneva; N. Mankuzhiyil; K. Mannheim; L. Maraschi; B. Marcote; M. Mariotti; M. Martínez; D. Mazin; U. Menzel; M. Meucci; J. M. Miranda; R. Mirzoyan; A. Moralejo; P. Munar-Adrover; D. Nakajima; A. Niedzwiecki; K. Nilsson; N. Nowak; R. Orito
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eye 9
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We performed a 4.5-month multi-instrument campaign (from radio to VHE gamma rays) on Mrk421 between January 2009 and June 2009, which included VLBA, F-GAMMA, GASP-WEBT, Swift, RXTE, Fermi-LAT, MAGIC, and Whipple, among other instruments and collaborations. Mrk421 was found in its typical (non-flaring) activity state, with a VHE flux of about half that of the Crab Nebula, yet the light curves show significant variability at all wavelengths, the highest variability being in the X-rays. We...
Topics: High Energy Astrophysical Phenomena, Astrophysics
Source: http://arxiv.org/abs/1502.02650
82
82
Sep 24, 2013
09/13
Sep 24, 2013
by
V. A. Acciari; E. Aliu; T. Arlen; T. Aune; M. Bautista; M. Beilicke; W. Benbow; M. Böttcher; D. Boltuch; S. M. Bradbury; J. H. Buckley; V. Bugaev; K. Byrum; A. Cannon; A. Cesarini; L. Ciupik; W. Cui; R. Dickherber; C. Duke; A. Falcone; J. P. Finley; G. Finnegan; L. Fortson; A. Furniss; N. Galante; D. Gall; K. Gibbs; G. H. Gillanders; S. Godambe; J. Grube; R. Guenette; G. Gyuk; D. Hanna; J. Holder; C. M. Hui; T. B. Humensky; A. Imran; P. Kaaret; N. Karlsson; M. Kertzman; D. Kieda; A. Konopelko; H. Krawczynski; F. Krennrich; M. J. Lang; A. Lamerato; S. LeBohec; G. Maier; S. McArthur; A. McCann; M. McCutcheon; P. Moriarty; R. Mukherjee; R. A. Ong; A. N. Otte; D. Pandel; J. S. Perkins; D. Petry; A. Pichel; M. Pohl; J. Quinn; K. Ragan; L. C. Reyes; P. T. Reynolds; E. Roache; H. J. Rose; P. Roustazadeh; M. Schroedter; G. H. Sembroski; G. Demet Senturk; A. W. Smith; D. Steele; S. P. Swordy; G. Tešić; M. Theiling; S. Thibadeau; A. Varlotta; V. V. Vassiliev; S. Vincent; R. G. Wagner; S. P. Wakely; J. E. Ward; T. C. Weekes; A. Weinstein; T. Weisgarber; D. A. Williams; S. Wissel; M. Wood; B. Zitzer; M. Ackermann; M. Ajello; E. Antolini; L. Baldini; J. Ballet; G. Barbiellini; D. Bastieri; K. Bechtol; R. Bellazzini; B. Berenji; R. D. Blandford; E. D. Bloom; E. Bonamente; A. W. Borgland; A. Bouvier; J. Bregeon; M. Brigida; P. Bruel; R. Buehler; S. Buson; G. A. Caliandro; R. A. Cameron; P. A. Caraveo; S. Carrigan; J. M. Casandjian; E. Cavazzuti; C. Cecchi; Ö. Çelik; E. Charles; A. Chekhtman; C. C. Cheung; J. Chiang; S. Ciprini; R. Claus; J. Cohen-Tanugi; J. Conrad; C. D. Dermer; F. de Palma; E. do Couto e Silva; P. S. Drell; R. Dubois; D. Dumora; C. Farnier; C. Favuzzi; S. J. Fegan; P. Fortin; M. Frailis; Y. Fukazawa; S. Funk; P. Fusco; F. Gargano; D. Gasparrini; N. Gehrels; S. Germani; B. Giebels; N. Giglietto; F. Giordano; M. Giroletti; T. Glanzman; G. Godfrey; I. A. Grenier; J. E. Grove; S. Guiriec; E. Hays; D. Horan; R. E. Hughes; G. Jóhannesson; A. S. Johnson; W. N. Johnson; T. Kamae; H. Katagiri; J. Kataoka; J. Knödlseder; M. Kuss; J. Lande; L. Latronico; S. -H. Lee; M. Llena Garde; F. Longo; F. Loparco; B. Lott; M. N. Lovellette; P. Lubrano; A. Makeev; M. N. Mazziotta; P. F. Michelson; W. Mitthumsiri; T. Mizuno; A. A. Moiseev; C. Monte; M. E. Monzani; A. Morselli; I. V. Moskalenko; S. Murgia; P. L. Nolan; J. P. Norris; E. Nuss; M. Ohno; T. Ohsugi; N. Omodei; E. Orlando; J. F. Ormes; D. Paneque; J. H. Panetta; V. Pelassa; M. Pepe; M. Pesce-Rollins; F. Piron; T. A. Porter; S. Rainò; R. Rando; M. Razzano; A. Reimer; O. Reimer; J. Ripken; A. Y. Rodriguez; M. Roth; H. F. -W. Sadrozinski; D. Sanchez; A. Sander; J. D. Scargle; C. Sgrò; E. J. Siskind; P. D. Smith; G. Spandre; P. Spinelli; M. S. Strickman; D. J. Suson; H. Takahashi; T. Tanaka; J. B. Thayer; J. G. Thayer; D. J. Thompson; L. Tibaldo; D. F. Torres; G. Tosti; A. Tramacere; T. L. Usher; V. Vasileiou; N. Vilchez; V. Vitale; A. P. Waite; P. Wang; B. L. Winer; K. S. Wood; Z. Yang; T. Ylinen; M. Ziegler
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The high-frequency-peaked BL Lacertae object RGB J0710+591 was observed in the very high-energy (VHE; E > 100 GeV) wave band by the VERITAS array of atmospheric Cherenkov telescopes. The observations, taken between 2008 December and 2009 March and totaling 22.1 hr, yield the discovery of VHE gamma rays from the source. RGB J0710+591 is detected at a statistical significance of 5.5 standard deviations (5.5{\sigma}) above the background, corresponding to an integral flux of (3.9 +/- 0.8) x...
Source: http://arxiv.org/abs/1005.0041v1
68
68
Sep 24, 2013
09/13
Sep 24, 2013
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The VERITAS Collaboration; V. A. Acciari; E. Aliu; T. Arlen; T. Aune; M. Beilicke; W. Benbow; D. Boltuch; S. M. Bradbury; J. H. Buckley; V. Bugaev; K. Byrum; A. Cannon; A. Cesarini; Y. C. Chow; L. Ciupik; P. Cogan; W. Cui; R. Dickherber; C. Duke; J. P. Finley; G. Finnegan; P. Fortin; L. Fortson; A. Furniss; N. Galante; D. Gall; G. H. Gillanders; S. Godambe; J. Grube; R. Guenette; G. Gyuk; D. Hanna; J. Holder; C. M. Hui; T. B. Humensky; A. Imran; P. Kaaret; N. Karlsson; M. Kertzman; D. Kieda; A. Konopelko; H. Krawczynski; F. Krennrich; M. J. Lang; S. LeBohec; G. Maier; S. McArthur; A. McCann; M. McCutcheon; J. Millis; P. Moriarty; R. A. Ong; A. N. Otte; D. Pandel; J. S. Perkins; A. M. J. Quinn; K. Ragan; L. C. Reyes; P. T. Reynolds; E. Roache; H. J. Rose; A. C. Rovero; M. Schroedter; G. H. Sembroski; G. Demet Senturk; A. W. Smith; D. Steele; S. P. Swordy; M. Theiling; S. Thibadeau; A. Varlotta; S. Vincent; R. G. Wagner; S. P. Wakely; J. E. Ward; T. C. Weekes; A. Weinstein; T. Weisgarber; D. A. Williams; S. Wissel; M. Wood; B. Zitzer Chandra M87 Monitoring; :; D. E. Harris; F. Massaro
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M87 is a nearby radio galaxy that is detected at energies ranging from radio to VHE gamma-rays. Its proximity and its jet, misaligned from our line-of-sight, enable detailed morphological studies and extensive modeling at radio, optical, and X-ray energies. Flaring activity was observed at all energies, and multi-wavelength correlations would help clarify the origin of the VHE emission. In this paper, we describe a detailed temporal and spectral analysis of the VERITAS VHE gamma-ray...
Source: http://arxiv.org/abs/1005.0367v1
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Sep 23, 2013
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Sep 23, 2013
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E. Aliu; T. Arlen; T. Aune; M. Beilicke; W. Benbow; A. Bouvier; S. M. Bradbury; J. H. Buckley; V. Bugaev; K. Byrum; A. Cannon; A. Cesarini; L. Ciupik; E. Collins-Hughes; M. P. Connolly; W. Cui; R. Dickherber; C. Duke; M. Errando; A. Falcone; J. P. Finley; G. Finnegan; L. Fortson; A. Furniss; N. Galante; D. Gall; S. Godambe; S. Griffin; J. Grube; R. Guenette; G. Gyuk; D. Hanna; J. Holder; H. Huan; G. Hughes; C. M. Hui; T. B. Humensky; A. Imran; P. Kaaret; N. Karlsson; M. Kertzman; D. Kieda; H. Krawczynski; F. Krennrich; M. J. Lang; S. LeBohec; A. S Madhavan; G. Maier; P. Majumdar; S. McArthur; A. McCann; P. Moriarty; R. Mukherjee; P. D Nunez; R. A. Ong; M. Orr; A. N. Otte; N. Park; J. S. Perkins; A. Pichel; M. Pohl; H. Prokoph; J. Quinn; K. Ragan; L. C. Reyes; P. T. Reynolds; E. Roache; H. J. Rose; J. Ruppel; D. B. Saxon; M. Schroedter; G. H. Sembroski; G. D. Şentürk; C. Skole; D. Staszak; G. Tešić; M. Theiling; S. Thibadeau; K. Tsurusaki; J. Tyler; A. Varlotta; V. V. Vassiliev; S. Vincent; M. Vivier; S. P. Wakely; J. E. Ward; T. C. Weekes; A. Weinstein; T. Weisgarber; D. A. Williams; B. Zitzer
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VERITAS has been monitoring the very-high-energy (VHE; >100GeV) gamma-ray activity of the radio galaxy M87 since 2007. During 2008, flaring activity on a timescale of a few days was observed with a peak flux of (0.70 +- 0.16) X 10^{-11} cm^{-2} s^{-1} at energies above 350GeV. In 2010 April, VERITAS detected a flare from M87 with peak flux of (2.71 +- 0.68) X 10^{-11} cm^{-2} s^{-1} for E>350GeV. The source was observed for six consecutive nights during the flare, resulting in a total of...
Source: http://arxiv.org/abs/1112.4518v1
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Sep 23, 2013
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Sep 23, 2013
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G. Fossati; J. H. Buckley; I. H. Bond; S. M. Bradbury; D. A. Carter-Lewis; Y. C. K. Chow; W. Cui; A. D. Falcone; J. P. Finley; J. A. Gaidos; J. Grube; J. Holder; D. Horan; D. Horns; M. M. Jordan; D. B. Kieda; J. Kildea; H. Krawczynski; F. Krennrich; M. J. Lang; S. LeBohec; K. Lee; P. Moriarty; R. A. Ong; D. Petry; J. Quinn; G. H. Sembroski; S. P. Wakely; T. C. Weekes
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(Abridged) We present a detailed analysis of week-long simultaneous observations of the blazar Mrk421 at 2-60 keV X-rays (RXTE) and TeV gamma-rays (Whipple and HEGRA) in 2001. The unprecedented quality of this dataset enables us to establish firmly the existence of the correlation between the TeV and X-ray luminosities, and to start unveiling some of its more detailed characteristics, in particular its energy dependence, and time variability. The source shows strong, highly correlated...
Source: http://arxiv.org/abs/0710.4138v2
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Sep 23, 2013
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Sep 23, 2013
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V. A. Acciari; E. Aliu; T. Arlen; T. Aune; M. Beilicke; W. Benbow; S. M. Bradbury; J. H. Buckley; V. Bugaev; K. Byrum; A. Cannon; A. Cesarini; L. Ciupik; E. Collins-Hughes; M. P. Connolly; W. Cui; R. Dickherber; C. Duke; M. Errando; A. Falcone; J. P. Finley; G. Finnegan; L. Fortson; A. Furniss; N. Galante; D. Gall; G. H. Gillanders; S. Godambe; S. Griffin; J. Grube; R. Guenette; G. Gyuk; D. Hanna; J. Holder; G. Hughes; C. M. Hui; T. B. Humensky; P. Kaaret; N. Karlsson; M. Kertzman; D. Kieda; H. Krawczynski; F. Krennrich; M. J. Lang; S. LeBohec; G. Maier; P. Majumdar; S. McArthur; A. McCann; P. Moriarty; R. Mukherjee; R. A. Ong; M. Orr; A. N. Otte; N. Park; J. S. Perkins; M. Pohl; H. Prokoph; J. Quinn; K. Ragan; L. C. Reyes; P. T. Reynolds; E. Roache; H. J. Rose; J. Ruppel; D. B. Saxon; M. Schroedter; G. H. Sembroski; G. Demet Senturk; A. W. Smith; D. Staszak; G. Tesic; M. Theiling; S. Thibadeau; K. Tsurusaki; A. Varlotta; V. V. Vassiliev; S. Vincent; M. Vivier; S. P. Wakely; J. E. Ward; T. C. Weekes; A. Weinstein; T. Weisgarber; D. A. Williams; B. Zitzer
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We present the results of observations of the TeV binary LS I +61 303 with the VERITAS telescope array between 2008 and 2010, at energies above 300 GeV. In the past, both ground-based gamma-ray telescopes VERITAS and MAGIC have reported detections of TeV emission near the apastron phases of the binary orbit. The observations presented here show no strong evidence for TeV emission during these orbital phases; however, during observations taken in late 2010, significant emission was detected from...
Source: http://arxiv.org/abs/1105.0449v1
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Sep 23, 2013
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Sep 23, 2013
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M. Wood; G. Blaylock; S. M. Bradbury; J. H. Buckley; K. L. Byrum; Y. C. K. Chow; W. Cui; I. de la Calle Perez; A. D. Falcone; S. J. Fegan; J. P. Finley; J. Grube; J. Hall; D. Hanna; J. Holder; D. Horan; T. B. Humensky; D. B. Kieda; J. Kildea; A. Konopelko; H. Krawczynski; F. Krennrich; M. J. Lang; S. LeBohec; T. Nagai; R. A. Ong; J. S. Perkins; M. Pohl; J. Quinn; H. J. Rose; G. H. Sembroski; V. V. Vassiliev; R. G. Wagner; S. P. Wakely; T. C. Weekes; A. Weinstein
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We present observations of the dwarf galaxies Draco and Ursa Minor, the local group galaxies M32 and M33, and the globular cluster M15 conducted with the Whipple 10m gamma-ray telescope to search for the gamma-ray signature of self-annihilating weakly interacting massive particles (WIMPs) which may constitute astrophysical dark matter (DM). We review the motivations for selecting these sources based on their unique astrophysical environments and report the results of the data analysis which...
Source: http://arxiv.org/abs/0801.1708v1
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Sep 23, 2013
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Sep 23, 2013
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K. Byrum; J. Buckley; S. Bugayov; B. Dingus; S. Fegan; S. Funk; E. Hays; J. Holder; D. Horan; A. Konopelko; H. Krawczynski; F. Krennrich; S. Lebohec; G. Sinnis; A. Smith; V. Vassiliev; S. Wakely
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This is a report on the findings of the technology working group for the white paper on the status and future of TeV gamma-ray astronomy. The white paper is an APS commissioned document, and the overall version has also been released and can be found on astro-ph. This detailed section of the white paper discusses different technology opportunities and the technical feasibility for substantially improving IACTS and ground based particle detectors to achieve an order of magnitude better...
Source: http://arxiv.org/abs/0810.4367v1
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Sep 23, 2013
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Sep 23, 2013
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F. Krennrich; E. Dwek; A. Imran
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We combine the recent estimate of the contribution of galaxies to the 3.6 micron intensity of the extragalactic background light (EBL) with optical and near-infrared (IR) galaxy counts to set new limits on intrinsic spectra of some of the most distant TeV blazars 1ES 0229+200, 1ES 1218+30.4, and 1ES 1101-232, located at redshifts 0.1396, 0.182, and 0.186, respectively. The new lower limit on the 3.6 micron EBL intensity is significantly higher than the previous one set by the cumulative...
Source: http://arxiv.org/abs/0810.2522v1
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Sep 23, 2013
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Sep 23, 2013
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J. Holder; V. A. Acciari; E. Aliu; T. Arlen; M. Beilicke; W. Benbow; S. M. Bradbury; J. H. Buckley; V. Bugaev; Y. Butt; K. L. Byrum; A. Cannon; O. Celik; A. Cesarini; L. Ciupik; Y. C. K. Chow; P. Cogan; P. Colin; W. Cui; M. K. Daniel; T. Ergin; A. D. Falcone; S. J. Fegan; J. P. Finley; G. Finnegan; P. Fortin; L. F. Fortson; A. Furniss; G. H. Gillanders; J. Grube; R. Guenette; G. Gyuk; D. Hanna; E. Hays; D. Horan; C. M. Hui; T. B. Humensky; A. Imran; P. Kaaret; N. Karlsson; M. Kertzman; D. B. Kieda; J. Kildea; A. Konopelko; H. Krawczynski; F. Krennrich; M. J. Lang; S. LeBohec; G. Maier; A. McCann; M. McCutcheon; P. Moriarty; R. Mukherjee; T. Nagai; J. Niemiec; R. A. Ong; D. Pandel; J. S. Perkins; M. Pohl; J. Quinn; K. Ragan; L. C. Reyes; P. T. Reynolds; H. J. Rose; M. Schroedter; G. H. Sembroski; A. W. Smith; D. Steele; S. P. Swordy; J. A. Toner; L. Valcarcel; V. V. Vassiliev; R. Wagner; S. P. Wakely; J. E. Ward; T. C. Weekes; A. Weinstein; R. J. White; D. A. Williams; S. A. Wissel; M. Wood; B. Zitzer
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VERITAS, an Imaging Atmospheric Cherenkov Telescope (IACT) system for gammma-ray astronomy in the GeV-TeV range, has recently completed its first season of observations with a full array of four telescopes. A number of astrophysical gamma-ray sources have been detected, both galactic and extragalactic, including sources previously unknown at TeV energies. We describe the status of the array and some highlight results, and assess the technical performance, sensitivity and shower reconstruction...
Source: http://arxiv.org/abs/0810.0474v1
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Sep 23, 2013
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Sep 23, 2013
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V. V. Vassiliev; D. A. Carter-Lewis; A. M. Hillas; M. P. Kertzman; J. Knapp; F. Krennrich; R. W. Lessard; H. J. Rose; G. H. Sembroski
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VERITAS is a proposed major ground-based gamma-ray observatory to be built at the Whipple Observatory in southern Arizona, USA. It will consist of an array of seven 10m imaging Cherenkov telescopes designed to conduct gamma-ray observations in the energy range of 50 GeV - 50 TeV. A description of the baseline VERITAS design and optimization criteria are presented. We provide basic characteristics of the array performance for observations of point sources, such as angular resolution, energy...
Source: http://arxiv.org/abs/astro-ph/9908135v1
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Sep 23, 2013
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Sep 23, 2013
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E. Aliu; T. Aune; M. Beilicke; W. Benbow; M. Böttcher; A. Bouvier; S. M. Bradbury; J. H. Buckley; V. Bugaev; A. Cannon; A. Cesarini; L. Ciupik; M. P. Connolly; W. Cui; G. Decerprit; R. Dickherber; C. Duke; M. Errando; A. Falcone; Q. Feng; G. Finnegan; L. Fortson; A. Furniss; N. Galante; D. Gall; G. H. Gillanders; S. Godambe; S. Griffin; J. Grube; G. Gyuk; D. Hanna; B. Hivick; J. Holder; H. Huan; G. Hughes; C. M. Hui; T. B. Humensky; P. Kaaret; N. Karlsson; M. Kertzman; D. Kieda; H. Krawczynski; F. Krennrich; G. Maier; P. Majumdar; S. McArthur; A. McCann; P. Moriarty; R. Mukherjee; T. Nelson; R. A. Ong; M. Orr; A. N. Otte; N. Park; J. S. Perkins; A. Pichel; M. Pohl; H. Prokoph; J. Quinn; K. Ragan; L. C. Reyes; P. T. Reynolds; E. Roache; H. J. Rose; J. Ruppel; D. B. Saxon; G. H. Sembroski; C. Skole; A. W. Smith; D. Staszak; G. Tesic; M. Theiling; S. Thibadeau; K. Tsurusaki; J. Tyler; A. Varlotta; V. V. Vassiliev; S. P. Wakely; T. C. Weekes; A. Weinstein; D. A. Williams; B. Zitzer; S. Ciprini; M. Fumagalli; K. Kaplan; D. Paneque; J. X. Prochaska
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We report on the VERITAS discovery of very-high-energy (VHE) gamma- ray emission above 200 GeV from the high-frequency-peaked BL Lac object RXJ0648.7+1516 (GBJ0648+1516), associated with 1FGLJ0648.8+1516. The photon spectrum above 200 GeV is fit by a power law dN/dE = F0(E/E0)-{\Gamma} with a photon index {\Gamma} of 4.4 {\pm} 0.8stat {\pm}0.3syst and a flux normalization F0 of (2.3 {\pm}0.5stat {\pm} 1.2sys) {\times} 10-11 TeV-1cm-2s-1 with E0 = 300 GeV. No VHE vari- ability is detected during...
Source: http://arxiv.org/abs/1110.5949v2
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Sep 23, 2013
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Sep 23, 2013
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The VERITAS Collaboration; V. A. Acciari; T. Arlen; T. Aune; M. Beilicke; W. Benbow; D. Boltuch; S. M. Bradbury; J. H. Buckley; V. Bugaev; K. Byrum; A. Cannon; A. Cesarini; J. L. Christiansen; L. Ciupik; W. Cui; R. Dickherber; C. Duke; J. P. Finley; G. Finnegan; A. Furniss; N. Galante; S. Godambe; J. Grube; R. Guenette; G. Gyuk; D. Hanna; J. Holder; C. M. Hui; T. B. Humensky; A. Imran; P. Kaaret; N. Karlsson; M. Kertzman; D. Kieda; A. Konopelko; H. Krawczynski; F. Krennrich; G. Maier; S. McArthur; A. McCann; M. McCutcheon; P. Moriarty; R. A. Ong; A. N. Otte; D. Pandel; J. S. Perkins; M. Pohl; J. Quinn; K. Ragan; L. C. Reyes; P. T. Reynolds; E. Roache; H. J. Rose; M. Schroedter; G. H. Sembroski; G. Demet Senturk; A. W. Smith; D. Steele; S. P. Swordy; G. Tešić; M. Theiling; S. Thibadeau; A. Varlotta; V. V. Vassiliev; S. Vincent; R. G. Wagner; S. P. Wakely; J. E. Ward; T. C. Weekes; A. Weinstein; T. Weisgarber; D. A. Williams; S. Wissel; M. D. Wood; B. Zitzer
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Indirect dark matter searches with ground-based gamma-ray observatories provide an alternative for identifying the particle nature of dark matter that is complementary to that of direct search or accelerator production experiments. We present the results of observations of the dwarf spheroidal galaxies Draco, Ursa Minor, Bootes 1, and Willman 1 conducted by VERITAS. These galaxies are nearby dark matter dominated objects located at a typical distance of several tens of kiloparsecs for which...
Source: http://arxiv.org/abs/1006.5955v2
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Sep 23, 2013
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Sep 23, 2013
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J. Holder; E. Aliu; T. Arlen; T. Aune; M. Beilicke; W. Benbow; M. Böttcher; A. Bouvier; J. H. Buckley; V. Bugaev; K. Byrum; A. Cannon; A. Cesarini; J. L. Christiansen; L. Ciupik; E. Collins-Hughes; M. P. Connolly; W. Cui; R. Dickherber; C. Duke; V. V. Dwarkadas; M. Errando; A. Falcone; J. P. Finley; G. Finnegan; L. Fortson; A. Furniss; N. Galante; D. Gall; K. Gibbs; G. H. Gillanders; S. Godambe; S. Griffin; J. Grube; R. Guenette; G. Gyuk; D. Hanna; H. Huan; G. Hughes; C. M. Hui; T. B. Humensky; A. Imran; P. Kaaret; N. Karlsson; M. Kertzman; Y. Khassen; D. Kieda; H. Krawczynski; F. Krennrich; M. J. Lang; M. Lyutikov; A. S Madhavan; G. Maier; P. Majumdar; S. McArthur; A. McCann; M. McCutcheon; P. Moriarty; R. Mukherjee; P. D Nunez; R. A. Ong; M. Orr; A. N. Otte; N. Park; J. S. Perkins; A. Pichel; F. Pizlo; M. Pohl; H. Prokoph; J. Quinn; K. Ragan; L. C. Reyes; P. T. Reynolds; A. C. Rovero; J. Ruppel; A. C. Sadun; D. B. Saxon; M. Schroedter; G. H. Sembroski; G. D. Şentürk; A. W. Smith; D. Staszak; G. Tešić; M. Theiling; S. Thibadeau; K. Tsurusaki; J. Tyler; A. Varlotta; V. V. Vassiliev; S. Vincent; M. Vivier; S. P. Wakely; J. E. Ward; T. C. Weekes; A. Weinstein; T. Weisgarber; D. A. Williams; B. Zitzer
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The VERITAS telescope array has been operating smoothly since 2007, and has detected gamma-ray emission above 100 GeV from 40 astrophysical sources. These include blazars, pulsar wind nebulae, supernova remnants, gamma-ray binary systems, a starburst galaxy, a radio galaxy, the Crab pulsar, and gamma-ray sources whose origin remains unidentified. In 2009, the array was reconfigured, greatly improving the sensitivity. We summarize the current status of the observatory, describe some of the...
Source: http://arxiv.org/abs/1111.1225v1
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Sep 23, 2013
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Sep 23, 2013
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The H. E. S. S. Collaboration; :; A. Abramowski; F. Acero; F. Aharonian; A. G. Akhperjanian; G. Anton; A. Balzer; A. Barnacka; U. Barres de Almeida; Y. Becherini; J. Becker; B. Behera; K. Bernlöhr; E. Birsin; J. Biteau; A. Bochow; C. Boisson; J. Bolmont; P. Bordas; J. Brucker; F. Brun; P. Brun; T. Bulik; I. Büsching; S. Carrigan; S. Casanova; M. Cerruti; P. M. Chadwick; A. Charbonnier; R. C. G. Chaves; A. Cheesebrough; A. C. Clapson; G. Coignet; G. Cologna; J. Conrad; M. Dalton; M. K. Daniel; I. D. Davids; B. Degrange; C. Deil; H. J. Dickinson; A. Djannati-Ataï; W. Domainko; L. O'C. Drury; G. Dubus; K. Dutson; J. Dyks; M. Dyrda; K. Egberts; P. Eger; P. Espigat; L. Fallon; C. Farnier; S. Fegan; F. Feinstein; M. V. Fernandes; A. Fiasson; G. Fontaine; A. Förster; M. Füßling; Y. A. Gallant; H. Gast; L. Gérard; D. Gerbig; B. Giebels; J. F. Glicenstein; B. Glück; P. Goret; D. Göring; S. Häffner; J. D. Hague; D. Hampf; M. Hauser; S. Heinz; G. Heinzelmann; G. Henri; G. Hermann; J. A. Hinton; A. Hoffmann; W. Hofmann; P. Hofverberg; M. Holler; D. Horns; A. Jacholkowska; O. C. de Jager; C. Jahn; M. Jamrozy; I. Jung; M. A. Kastendieck; K. Katarzyński; U. Katz; S. Kaufmann; D. Keogh; D. Khangulyan; B. Khélifi; D. Klochkov; W. Kluźniak; T. Kneiske; Nu. Komin; K. Kosack; R. Kossakowski; H. Laffon; G. Lamanna; D. Lennarz; T. Lohse; A. Lopatin; C. -C. Lu; V. Marandon; A. Marcowith; J. Masbou; D. Maurin; N. Maxted; M. Mayer; T. J. L. McComb; M. C. Medina; J. Méhault; R. Moderski; E. Moulin; C. L. Naumann; M. Naumann-Godo; M. de Naurois; D. Nedbal; D. Nekrassov; N. Nguyen; B. Nicholas; J. Niemiec; S. J. Nolan; S. Ohm; E. de Oña Wilhelmi; B. Opitz; M. Ostrowski; I. Oya; M. Panter; M. Paz Arribas; G. Pedaletti; G. Pelletier; P. -O. Petrucci; S. Pita; G. Pühlhofer; M. Punch; A. Quirrenbach; M. Raue; S. M. Rayner; A. Reimer; O. Reimer; M. Renaud; R. de los Reyes; F. Rieger; J. Ripken; L. Rob; S. Rosier-Lees; G. Rowell; B. Rudak; C. B. Rulten; J. Ruppel; V. Sahakian; D. A. Sanchez; A. Santangelo; R. Schlickeiser; F. M. Schöck; A. Schulz; U. Schwanke; S. Schwarzburg; S. Schwemmer; F. Sheidaei; J. L. Skilton; H. Sol; G. Spengler; Ł. Stawarz; R. Steenkamp; C. Stegmann; F. Stinzing; K. Stycz; I. Sushch; A. Szostek; J. -P. Tavernet; R. Terrier; M. Tluczykont; K. Valerius; C. van Eldik; G. Vasileiadis; C. Venter; J. P. Vialle; A. Viana; P. Vincent; H. J. Völk; F. Volpe; S. Vorobiov; M. Vorster; S. J. Wagner; M. Ward; R. White; A. Wierzcholska; M. Zacharias; A. Zajczyk; A. A. Zdziarski; A. Zech; H. -S. Zechlin; The MAGIC Collaboration; :; J. Aleksić; L. A. Antonelli; P. Antoranz; M. Backes; J. A. Barrio; D. Bastieri; J. Becerra González; W. Bednarek; A. Berdyugin; K. Berger; E. Bernardini; A. Biland; O. Blanch; R. K. Bock; A. Boller; G. Bonnoli; D. Borla Tridon; I. Braun; T. Bretz; A. Cañellas; E. Carmona; A. Carosi; P. Colin; E. Colombo; J. L. Contreras; J. Cortina; L. Cossio; S. Covino; F. Dazzi; A. De Angelis; E. De Cea del Pozo; B. De Lotto; C. Delgado Mendez; A. Diago Ortega; M. Doert; A. Domínguez; D. Dominis Prester; D. Dorner; M. Doro; D. Elsaesser; D. Ferenc; M. V. Fonseca; L. Font; C. Fruck; R. J. García López; M. Garczarczyk; D. Garrido; G. Giavitto; N. Godinović; D. Hadasch; D. Häfner; A. Herrero; D. Hildebrand; D. Höhne-Mönch; J. Hose; D. Hrupec; B. Huber; T. Jogler; S. Klepser; T. Krähenbühl; J. Krause; A. La Barbera; D. Lelas; E. Leonardo; E. Lindfors; S. Lombardi; M. López; E. Lorenz; M. Makariev; G. Maneva; N. Mankuzhiyil; K. Mannheim; L. Maraschi; M. Mariotti; M. Martínez; D. Mazin; M. Meucci; J. M. Miranda; R. Mirzoyan; H. Miyamoto; J. Moldón; A. Moralejo; P. Munar; D. Nieto; K. Nilsson; R. Orito; I. Oya; D. Paneque; R. Paoletti; S. Pardo; J. M. Paredes; S. Partini; M. Pasanen; F. Pauss; M. A. Perez-Torres; M. Persic; L. Peruzzo; M. Pilia; J. Pochon; F. Prada; P. G. Prada Moroni; E. Prandini; I. Puljak; I. Reichardt; R. Reinthal; W. Rhode; M. Ribó; J. Rico; S. Rügamer; A. Saggion; K. Saito; T. Y. Saito; M. Salvati; K. Satalecka; V. Scalzotto; V. Scapin; C. Schultz; T. Schweizer; M. Shayduk; S. N. Shore; A. Sillanpää; J. Sitarek; D. Sobczynska; F. Spanier; S. Spiro; A. Stamerra; B. Steinke; J. Storz; N. Strah; T. Surić; L. Takalo; H. Takami; F. Tavecchio; P. Temnikov; T. Terzić; D. Tescaro; M. Teshima; M. Thom; O. Tibolla; D. F. Torres; A. Treves; H. Vankov; P. Vogler; R. M. Wagner; Q. Weitzel; V. Zabalza; F. Zandanel; R. Zanin; The VERITAS Collaboration; :; T. Arlen; T. Aune; M. Beilicke; W. Benbow; A. Bouvier; S. M. Bradbury; J. H. Buckley; V. Bugaev; K. Byrum; A. Cannon; A. Cesarini; L. Ciupik; M. P. Connolly; W. Cui; R. Dickherber; C. Duke; M. Errando; A. Falcone; J. P. Finley; G. Finnegan; L. Fortson; A. Furniss; N. Galante; D. Gall; S. Godambe; S. Griffin; J. Grube; G. Gyuk; D. Hanna; J. Holder; H. Huan; C. M. Hui; P. Kaaret; N. Karlsson; M. Kertzman; Y. Khassen; D. Kieda; H. Krawczynski; F. Krennrich; M. J. Lang; S. LeBohec; G. Maier; S. McArthur; A. McCann; P. Moriarty; R. Mukherjee; P. D. Nuñez; R. A. Ong; M. Orr; A. N. Otte; N. Park; J. S. Perkins; A. Pichel; M. Pohl; H. Prokoph; K. Ragan; L. C. Reyes; P. T. Reynolds; E. Roache; H. J. Rose; J. Ruppel; M. Schroedter; G. H. Sembroski; G. D. Şentürk; I. Telezhinsky; G. Tešić; M. Theiling; S. Thibadeau; A. Varlotta; V. V. Vassiliev; M. Vivier; S. P. Wakely; T. C. Weekes; D. A. Williams; B. Zitzer; U. Barres de Almeida; M. Cara; C. Casadio; C. C. Cheung; W. McConville; F. Davies; A. Doi; G. Giovannini; M. Giroletti; K. Hada; P. Hardee; D. E. Harris; W. Junor; M. Kino; N. P. Lee; C. Ly; J. Madrid; F. Massaro; C. G. Mundell; H. Nagai; E. S. Perlman; I. A. Steele; R. C. Walker; D. L. Wood
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Abridged: The giant radio galaxy M 87 with its proximity, famous jet, and very massive black hole provides a unique opportunity to investigate the origin of very high energy (VHE; E>100 GeV) gamma-ray emission generated in relativistic outflows and the surroundings of super-massive black holes. M 87 has been established as a VHE gamma-ray emitter since 2006. The VHE gamma-ray emission displays strong variability on timescales as short as a day. In this paper, results from a joint VHE...
Source: http://arxiv.org/abs/1111.5341v2
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Sep 23, 2013
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Sep 23, 2013
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The VERITAS Collaboration; V. A. Acciari; T. Arlen; T. Aune; M. Beilicke; W. Benbow; M. Böttcher; D. Boltuch; S. M. Bradbury; J. H. Buckley; V. Bugaev; A. Cannon; A. Cesarini; L. Ciupik; W. Cui; R. Dickherber; C. Duke; M. Errando; A. Falcone; J. P. Finley; G. Finnegan; L. Fortson; A. Furniss; N. Galante; D. Gall; S. Godambe; J. Grube; R. Guenette; G. Gyuk; D. Hanna; J. Holder; D. Huang; C. M. Hui; T. B. Humensky; A. Imran; P. Kaaret; N. Karlsson; M. Kertzman; D. Kieda; A. Konopelko; H. Krawczynski; F. Krennrich; A. S Madhavan; G. Maier; S. McArthur; A. McCann; P. Moriarty; R. A. Ong; A. N. Otte; D. Pandel; J. S. Perkins; A. Pichel; M. Pohl; J. Quinn; K. Ragan; L. C. Reyes; P. T. Reynolds; E. Roache; H. J. Rose; M. Schroedter; G. H. Sembroski; D. Steele; S. P. Swordy; M. Theiling; S. Thibadeau; A. Varlotta; V. V. Vassiliev; S. Vincent; S. P. Wakely; J. E. Ward; T. C. Weekes; A. Weinstein; T. Weisgarber; D. A. Williams; M. Wood; B. Zitzer; The MAGIC Collaboration; :; J. Aleksić; L. A. Antonelli; P. Antoranz; M. Backes; J. A. Barrio; D. Bastieri; J. Becerra González; W. Bednarek; A. Berdyugin; K. Berger; E. Bernardini; A. Biland; O. Blanch; R. K. Bock; A. Boller; G. Bonnoli; P. Bordas; D. Borla Tridon; V. Bosch-Ramon; D. Bose; I. Braun; T. Bretz; M. Camara; E. Carmona; A. Carosi; P. Colin; E. Colombo; J. L. Contreras; J. Cortina; S. Covino; F. Dazzi; A. De Angelis; E. De Cea del Pozo; B. De Lotto; M. De Maria; F. De Sabata; C. Delgado Mendez; A. Diago Ortega; M. Doert; A. Domínguez; D. Dominis Prester; D. Dorner; M. Doro; D. Elsaesser; M. Errando; D. Ferenc; M. V. Fonseca; L. Font; R. J. García López; M. Garczarczyk; M. Gaug; G. Giavitto; N. Godinović; D. Hadasch; A. Herrero; D. Hildebrand; D. Höhne-Mönch; J. Hose; D. Hrupec; T. Jogler; S. Klepser; T. Krähenbühl; D. Kranich; J. Krause; A. La Barbera; E. Leonardo; E. Lindfors; S. Lombardi; F. Longo; M. López; E. Lorenz; P. Majumdar; M. Makariev; G. Maneva; N. Mankuzhiyil; K. Mannheim; L. Maraschi; M. Mariotti; M. Martínez; D. Mazin; M. Meucci; J. M. Miranda; R. Mirzoyan; H. Miyamoto; J. Moldón; A. Moralejo; D. Nieto; K. Nilsson; R. Orito; I. Oya; R. Paoletti; J. M. Paredes; S. Partini; M. Pasanen; F. Pauss; R. G. Pegna; M. A. Perez-Torres; M. Persic; L. Peruzzo; J. Pochon; F. Prada; P. G. Prada Moroni; E. Prandini; N. Puchades; I. Puljak; I. Reichardt; R. Reinthal; W. Rhode; M. Ribó; J. Rico; M. Rissi; S. Rügamer; A. Saggion; K. Saito; T. Y. Saito; M. Salvati; M. Sánchez-Conde; K. Satalecka; V. Scalzotto; V. Scapin; C. Schultz; T. Schweizer; M. Shayduk; S. N. Shore; A. Sierpowska-Bartosik; A. Sillanpää; J. Sitarek; D. Sobczynska; F. Spanier; S. Spiro; A. Stamerra; B. Steinke; J. Storz; N. Strah; J. C. Struebig; T. Suric; L. Takalo; F. Tavecchio; P. Temnikov; T. Terzić; D. Tescaro; M. Teshima; D. F. Torres; H. Vankov; R. M. Wagner; Q. Weitzel; V. Zabalza; F. Zandanel; R. Zanin; D. Paneque; M. Hayashida
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The very high energy (VHE; E > 100 GeV) blazar Markarian 501 has a well-studied history of extreme spectral variability and is an excellent laboratory for studying the physical processes within the jets of active galactic nuclei. However, there are few detailed multiwavelength studies of Markarian 501 during its quiescent state, due to its low luminosity. A short-term multiwavelength study of Markarian 501 was coordinated in March 2009, focusing around a multi-day observation with the Suzaku...
Source: http://arxiv.org/abs/1012.2200v1
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Sep 23, 2013
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Sep 23, 2013
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VERITAS Collaboration; V. A. Acciari; E. Aliu; T. Arlen; M. Bautista; M. Beilicke; W. Benbow; M. Bottcher; S. M. Bradbury; V. Bugaev; Y. Butt; Y. Butt; K. Byrum0; A. Cannon; A. Cesarini; Y. C. Chow; L. Ciupik; P. Cogan; P. Colin; W. Cui; M. Daniel; R. Dickherber; T. Ergin; A. Falcone; S. J. Fegan; J. P. Finley; P. Fortin; L. Fortson; A. Furniss; D. Gall; G. H. Gillanders; J. Grube; R. Guenette; G. Gyuk; D. Hanna; E. Hays; J. Holder; D. Horan; C. M. Hui; T. B. Humensky; P. Kaaret; N. Karlsson; D. Kieda; J. Kildea; A. Konopelko; H. Krawczynski; F. Krennrich; M. J. Lang; S. LeBohec; G. Maier; A. McCann; M. McCutcheon; J. Millis; P. Moriarty; R. Mukherjee; T. Nagai; R. A. Ong; A. N. Otte; D. Pandel; J. S. Perkins; J. S. Perkins; M. Pohl; J. Quinn; K. Ragan; L. C. Reyes; P. T. Reynolds; E. Roache; H. J. Rose; M. Schroedter; G. H. Sembroski; A. W. Smith; D. Steele; M. Stroh; S. Swordy; M. Theiling; J. A. Toner; A. Varlotta; V. V. Vassiliev; R. G. Wagner; S. P. Wakely; J. E. Ward; T. C. Weekes; A. Weinsteiny; R. J. White; D. A. Williams; S. Wissely; M. Woody; B. Zitzer
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We present results from a long-term monitoring campaign on the TeV binary LSI +61 303 with VERITAS at energies above 500 GeV, and in the 2-10 keV hard X-ray bands with RXTE and Swift, sampling nine 26.5 day orbital cycles between September 2006 and February 2008. The binary was observed by VERITAS to be variable, with all integrated observations resulting in a detection at the 8.8 sigma (2006/2007) and 7.3 sigma (2007/2008) significance level for emission above 500 GeV. The source was detected...
Source: http://arxiv.org/abs/0904.4422v1
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Sep 23, 2013
09/13
Sep 23, 2013
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E. Aliu; S. Archambault; T. Arlen; T. Aune; M. Beilicke; W. Benbow; A. Bouvier; S. M. Bradbury; J. H. Buckley; V. Bugaev; K. Byrum; A. Cannon; A. Cesarini; J. L. Christiansen; L. Ciupik; E. Collins-Hughes; M. P. Connolly; W. Cui; G. Decerprit; R. Dickherber; J. Dumm; M. Errando; A. Falcone; Q. Feng; F. Ferrer; J. P. Finley; G. Finnegan; L. Fortson; A. Furniss; N. Galante; D. Gall; S. Godambe; S. Griffin; J. Grube; G. Gyuk; D. Hanna; J. Holder; H. Huan; G. Hughes; T. B. Humensky; P. Kaaret; N. Karlsson; M. Kertzman; Y. Khassen; D. Kieda; H. Krawczynski; F. Krennrich; K. Lee; A. S Madhavan; G. Maier; P. Majumdar; S. McArthur; A. McCann; P. Moriarty; R. Mukherjee; R. A. Ong; M. Orr; A. N. Otte; N. Park; J. S. Perkins; M. Pohl; H. Prokoph; J. Quinn; K. Ragan; L. C. Reyes; P. T. Reynolds; E. Roache; H. J. Rose; J. Ruppel; D. B. Saxon; M. Schroedter; G. H. Sembroski; G. D. Senturk; C. Skole; A. W. Smith; D. Staszak; I. Telezhinsky; G. Tesic; M. Theiling; S. Thibadeau; K. Tsurusaki; A. Varlotta; V. V. Vassiliev; S. Vincent; M. Vivier; R. G. Wagner; S. P. Wakely; J. E. Ward; T. C. Weekes; A. Weinstein; T. Weisgarber; D. A. Williams; B. Zitzer; for the VERITAS Collaboration
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The VERITAS array of Cherenkov telescopes has carried out a deep observational program on the nearby dwarf spheroidal galaxy Segue 1. We report on the results of nearly 48 hours of good quality selected data, taken between January 2010 and May 2011. No significant $\gamma$-ray emission is detected at the nominal position of Segue 1, and upper limits on the integrated flux are derived. According to recent studies, Segue 1 is the most dark matter-dominated dwarf spheroidal galaxy currently known....
Source: http://arxiv.org/abs/1202.2144v1
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Sep 23, 2013
09/13
Sep 23, 2013
by
VERITAS Collaboration; V. A. Acciari; E. Aliu; T. Arlen; T. Aune; M. Beilicke; W. Benbow; S. M. Bradbury; J. H. Buckley; V. Bugaev; K. Byrum; A. Cannon; A. Cesarini; J. L. Christiansen; L. Ciupik; E. Collins-Hughes; M. P. Connolly; W. Cui; C. Duke; M. Errando; A. Falcone; J. P. Finley; G. Finnegan; L. Fortson; A. Furniss; N. Galante; D. Gall; S. Godambe; S. Griffin; J. Grube; R. Guenette; G. Gyuk; D. Hanna; J. Holder; G. Hughes; C. M. Hui; T. B. Humensky; D. J. Jackson; P. Kaaret; N. Karlsson; M. Kertzman; D. Kieda; H. Krawczynski; F. Krennrich; M. J. Lang; A. S Madhavan; G. Maier; S. McArthur; A. McCann; P. Moriarty; M. D. Newbold; R. A. Ong; M. Orr; A. N. Otte; N. Park; J. S. Perkins; M. Pohl; H. Prokoph; J. Quinn; K. Ragan; L. C. Reyes; P. T. Reynolds; E. Roache; H. J. Rose; J. Ruppel; D. B. Saxon; M. Schroedter; G. H. Sembroski; G. D. Şentürk; A. W. Smith; D. Staszak; S. P. Swordy; G. Tešić; M. Theiling; S. Thibadeau; K. Tsurusaki; A. Varlotta; V. V. Vassiliev; S. Vincent; M. Vivier; S. P. Wakely; J. E. Ward; T. C. Weekes; A. Weinstein; T. Weisgarber; D. A. Williams; M. Wood
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We present the results of sixteen Swift-triggered GRB follow-up observations taken with the VERITAS telescope array from January, 2007 to June, 2009. The median energy threshold and response time of these observations was 260 GeV and 320 s, respectively. Observations had an average duration of 90 minutes. Each burst is analyzed independently in two modes: over the whole duration of the observations and again over a shorter time scale determined by the maximum VERITAS sensitivity to a burst with...
Source: http://arxiv.org/abs/1109.0050v2
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Sep 23, 2013
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Sep 23, 2013
by
F. Krennrich; S. Le Bohec; T. C. Weekes
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Gamma-ray observations above 200 MeV are conventionally made by satellite-based detectors. The EGRET detector on the Compton Gamma Ray Observatory (CGRO) has provided good sensitivity for the detection of bursts lasting for more than 200 ms. Theoretical predictions of high-energy gamma-ray bursts produced by quantum-mechanical decay of primordial black holes (Hawking 1971) suggest the emission of bursts on shorter time scales. The final stage of a primordial black hole results in a burst of...
Source: http://arxiv.org/abs/astro-ph/9909078v1
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40
Sep 23, 2013
09/13
Sep 23, 2013
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E. Aliu; S. Archambault; T. Arlen; T. Aune; M. Beilicke; W. Benbow; A. Bouvier; J. H. Buckley; V. Bugaev; A. Cesarini; L. Ciupik; E. Collins-Hughes; M. P. Connolly; W. Cui; R. Dickherber; C. Duke; J. Dumm; V. V. Dwarkadas; M. Errando; A. Falcone; S. Federici; Q. Feng; J. P. Finley; G. Finnegan; L. Fortson; A. Furniss; N. Galante; D. Gall; G. H. Gillanders; S. Godambe; E. V. Gotthelf; S. Griffin; J. Grube; G. Gyuk; D. Hanna; J. Holder; G. Hughes; T. B. Humensky; P. Kaaret; O. Kargaltsev; N. Karlsson; Y. Khassen; D. Kieda; H. Krawczynski; F. Krennrich; M. J. Lang; K. Lee; A. S Madhavan; G. Maier; P. Majumdar; S. McArthur; A. McCann; P. Moriarty; R. Mukherjee; T. Nelson; A. O'Faolain de Bhroithe; R. A. Ong; M. Orr; A. N. Otte; N. Park; J. S. Perkins; M. Pohl; H. Prokoph; J. Quinn; K. Ragan; L. C. Reyes; P. T. Reynolds; E. Roache; M. Roberts; D. B. Saxon; M. Schroedter; G. H. Sembroski; P. Slane; A. W. Smith; D. Staszak; I. Telezhinsky; G. Tesic; M. Theiling; S. Thibadeau; K. Tsurusaki; J. Tyler; A. Varlotta; V. V. Vassiliev; S. Vincent; M. Vivier; S. P. Wakely; T. C. Weekes; A. Weinstein; R. Welsing; D. A. Williams; B. Zitzer
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We report the discovery of TeV gamma-ray emission coincident with the shell-type radio supernova remnant (SNR) CTA 1 using the VERITAS gamma-ray observatory. The source, VER J0006+729, was detected as a 6.5 standard deviation excess over background and shows an extended morphology, approximated by a two-dimensional Gaussian of semi-major (semi-minor) axis 0.30 degree (0.24 degree) and a centroid 5' from the Fermi gamma-ray pulsar PSR J0007+7303 and its X-ray pulsar wind nebula (PWN). The photon...
Source: http://arxiv.org/abs/1212.4739v1
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Sep 22, 2013
09/13
Sep 22, 2013
by
S. LeBohec; F. Krennrich; G. Sleege
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The Short GAmma Ray Front Air Cherenkov Experiment (SGARFACE) is operated at the Whipple Observatory utilizing the Whipple 10m gamma-ray telescope. SGARFACE is sensitive to gamma-ray bursts of more than 100MeV with durations from 100ns to 35us and provides a fluence sensitivity as low as 0.8 gamma-rays per m^2 above 200MeV (0.05 gamma-rays per m^2 above 2GeV) and allows to record the burst time structure.
Source: http://arxiv.org/abs/astro-ph/0501199v1
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Sep 22, 2013
09/13
Sep 22, 2013
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The VERITAS Collaboration; V. A. Acciari; E. Aliu; M. Beilicke; W. Benbow; D. Boltuch; M. Böttcher; S. M. Bradbury; V. Bugaev; K. Byrum; A. Cesarini; L. Ciupik; P. Cogan; W. Cui; R. Dickherber; C. Duke; A. Falcone; J. P. Finley; G. Finnegan; L. Fortson; A. Furniss; N. Galante; D. Gall; K. Gibbs; R. Guenette; G. H. Gillanders; S. Godambe; J. Grube; D. Hanna; C. M. Hui; T. B. Humensky; A. Imran; P. Kaaret; N. Karlsson; M. Kertzman; D. Kieda; H. Krawczynski; F. Krennrich; M. J. Lang; S. LeBohec; G. Maier; S. McArthur; A. McCann; P. Moriarty; T. Nagai; R. A. Ong; A. N. Otte; D. Pandel; J. S. Perkins; A. Pichel; M. Pohl; J. Quinn; K. Ragan; L. C. Reyes; P. T. Reynolds; E. Roache; H. J. Rose; M. Schroedter; G. H. Sembroski; A. W. Smith; D. Steele; S. P. Swordy; M. Theiling; S. Thibadeau; V. V. Vassiliev; S. Vincent; S. P. Wakely; T. C. Weekes; A. Weinstein; T. Weisgarber; D. A. Williams
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We present results from an intensive VERITAS monitoring campaign of the high-frequency peaked BL Lac object 1ES 1218+304 in 2008/2009. Although 1ES 1218+304 was detected previously by MAGIC and VERITAS at a persistent level of ~6% of the Crab Nebula flux, the new VERITAS data reveal a prominent flare reaching ~20% of the Crab. While very high energy (VHE) flares are quite common in many nearby blazars, the case of 1ES 1218+304 (redshift z = 0.182) is particularly interesting since it belongs to...
Source: http://arxiv.org/abs/1001.2590v1
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Sep 22, 2013
09/13
Sep 22, 2013
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VERITAS collaboration; V. A. Acciari; E. Aliu; M. Araya; T. Arlen; T. Aune; M. Beilicke; W. Benbow; S. M. Bradbury; J. H. Buckley; V. Bugaev; K. Byrum; A. Cannon; A. Cesarini; L. Ciupik; E. Collins-Hughes; W. Cui; R. Dickherber; C. Duke; A. Falcone; J. P. Finley; L. Fortson; A. Furniss; N. Galante; D. Gall; S. Godambe; S. Griffin; R. Guenette; G. Gyuk; D. Hanna; J. Holder; G. Hughes; C. M. Hui; T. B. Humensky; A. Imran; P. Kaaret; M. Kertzman; H. Krawczynski; F. Krennrich; A. S. Madhavan; G. Maier; P. Majumdar; S. McArthur; P. Moriarty; R. A. Ong; A. N. Otte; D. Pandel; N. Park; J. S. Perkins; M. Pohl; H. Prokoph; J. Quinn; K. Ragan; L. C. Reyes; P. T. Reynolds; E. Roache; H. J. Rose; D. B. Saxon; G. H. Sembroski; G. Demet Senturk; A. W. Smith; G. Tešić; M. Theiling; S. Thibadeau; A. Varlotta; S. Vincent; M. Vivier; S. P. Wakely; J. E. Ward; T. C. Weekes; A. Weinstein; T. Weisgarber; S. Weng; D. A. Williams; M. Wood; B. Zitzer
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Giant X-ray outbursts, with luminosities of about $ 10^{37}$ erg s$^{-1}$, are observed roughly every 5 years from the nearby Be/pulsar binary 1A 0535+262. In this article, we present observations of the source with VERITAS at very-high energies (VHE; E$>$100 GeV) triggered by the X-ray outburst in December 2009. The observations started shortly after the onset of the outburst, and they provided comprehensive coverage of the episode, as well as the 111-day binary orbit. No VHE emission is...
Source: http://arxiv.org/abs/1103.3250v2
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Sep 22, 2013
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Sep 22, 2013
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E. Aliu; S. Archambault; T. Arlen; T. Aune; M. Beilicke; W. Benbow; A. Bouvier; J. H. Buckley; V. Bugaev; K. Byrum; A. Cesarini; L. Ciupik; E. Collins-Hughes; M. P. Connolly; W. Cui; R. Dickherber; C. Duke; J. Dumm; A. Falcone; S. Federici; Q. Feng; J. P. Finley; G. Finnegan; L. Fortson; A. Furniss; N. Galante; D. Gall; G. H. Gillanders; S. Godambe; S. Griffin; J. Grube; G. Gyuk; D. Hanna; J. Holder; H. Huan; G. Hughes; T. B. Humensky; P. Kaaret; N. Karlsson; Y. Khassen; D. Kieda; H. Krawczynski; F. Krennrich; M. J. Lang; S. LeBohec; K. Lee; M. Lyutikov; A. S Madhavan; G. Maier; P. Majumdar; S. McArthur; A. McCann; P. Moriarty; R. Mukherjee; T. Nelson; A. O'Faolain de Bhroithe; R. A. Ong; M. Orr; A. N. Otte; N. Park; J. S. Perkins; M. Pohl; H. Prokoph; J. Quinn; K. Ragan; L. C. Reyes; P. T. Reynolds; E. Roache; D. B. Saxon; M. Schroedter; G. H. Sembroski; G. D. Senturk; A. W. Smith; D. Staszak; I. Telezhinsky; G. Tesic; M. Theiling; S. Thibadeau; K. Tsurusaki; A. Varlotta; S. Vincent; M. Vivier; R. G. Wagner; S. P. Wakely; T. C. Weekes; A. Weinstein; R. Welsing; D. A. Williams; B. Zitzer; V. Kondratiev
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We present the results of a joint observational campaign between the Green Bank radio telescope and the VERITAS gamma-ray telescope, which searched for a correlation between the emission of very-high-energy (VHE) gamma rays ($E_{\gamma} >$ 150 GeV) and Giant Radio Pulses (GRPs) from the Crab pulsar at 8.9 GHz. A total of 15366 GRPs were recorded during 11.6 hours of simultaneous observations, which were made across four nights in December 2008 and in November and December 2009. We searched...
Source: http://arxiv.org/abs/1210.4786v1
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Sep 22, 2013
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Sep 22, 2013
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E. Aliu; S. Archambault; T. Arlen; T. Aune; M. Beilicke; W. Benbow; M. Bottcher; A. Bouvier; J. H. Buckley; V. Bugaev; A. Cesarini; L. Ciupik; E. Collins-Hughes; M. P. Connolly; W. Cui; R. Dickherber; C. Duke; J. Dumm; M. Errando; A. Falcone; S. Federici; Q. Feng; J. P. Finley; G. Finnegan; L. Fortson; A. Furniss; N. Galante; D. Gall; S. Godambe; S. Griffin; J. Grube; G. Gyuk; D. Hanna; J. Holder; H. Huan; P. Kaaret; N. Karlsson; Y. Khassen; D. Kieda; H. Krawczynski; F. Krennrich; K. Lee; A. S Madhavan; G. Maier; P. Majumdar; S. McArthur; A. McCann; P. Moriarty; R. Mukherjee; T. Nelson; A. O'Faolain de Bhroithe; R. A. Ong; M. Orr; A. N. Otte; N. Park; J. S. Perkins; A. Pichel; M. Pohl; H. Prokoph; J. Quinn; K. Ragan; L. C. Reyes; P. T. Reynolds; E. Roache; D. B. Saxon; G. H. Sembroski; D. Staszak; I. Telezhinsky; G. Tesic; M. Theiling; S. Thibadeau; K. Tsurusaki; A. Varlotta; V. V. Vassiliev; S. Vincent; M. Vivier; S. P. Wakely; T. C. Weekes; A. Weinstein; R. Welsing; D. A. Williams; B. Zitzer; P. Fortin; D. Horan; M. Fumagalli; K. Kaplan; J. X. Prochaska
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We report on VERITAS very-high-energy (VHE; E>100 GeV) observations of six blazars selected from the Fermi Large Area Telescope First Source Catalog (1FGL). The gamma-ray emission from 1FGL sources was extrapolated up to the VHE band, taking gamma-ray absorption by the extragalactic background light into account. This allowed the selection of six bright, hard-spectrum blazars that were good candidate TeV emitters. Spectroscopic redshift measurements were attempted with the Keck Telescope for...
Source: http://arxiv.org/abs/1210.7224v1
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Sep 22, 2013
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Sep 22, 2013
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VERITAS Collaboration; V. Acciari; E. Aliu; T. Arlen; M. Bautista; M. Beilicke; W. Benbow; M. Böttcher; S. M. Bradbury; J. H. Buckley; V. Bugaev; Y. Butt; K. Byrum; A. Cannon; O. Celik; A. Cesarini; Y. C. Chow; L. Ciupik; P. Cogan; P. Colin; W. Cui; R. Dickherber; C. Duke; T. Ergin; A. Falcone; S. J. Fegan; J. P. Finley; G. Finnegan; P. Fortin; L. Fortson; A. Furniss; D. Gall; K. Gibbs; G. H. Gillanders; J. Grube; R. Guenette; G. Gyuk; D. Hanna; E. Hays; J. Holder; D. Horan; C. M. Hui; T. B. Humensky; A. Imran; P. Kaaret; N. Karlsson; M. Kertzman; D. Kieda; J. Kildea; A. Konopelko; H. Krawczynski; F. Krennrich; M. J. Lang; S. LeBohec; G. Maier; A. McCann; M. McCutcheon; J. Millis; P. Moriarty; R. Mukherjee; T. Nagai; R. A. Ong; A. N. Otte; D. Pandel; J. S. Perkins; D. Petry; M. Pohl; J. Quinn; K. Ragan; L. C. Reyes; P. T. Reynolds; E. Roache; J. Rose; M. Schroedter; G. H. Sembroski; A. W. Smith; D. Steele; S. P. Swordy; M. Theiling; J. A. Toner; L. Valcarcel; A. Varlotta; V. V. Vassiliev; R. G. Wagner; S. P. Wakely; J. E. Ward; T. C. Weekes; A. Weinstein; R. J. White; D. A. Williams; S. Wissel; M. Wood; B. Zitzer
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The high-frequency-peaked BL-Lacertae object \objectname{1ES 0806+524}, at redshift z=0.138, was observed in the very-high-energy (VHE) gamma-ray regime by VERITAS between November 2006 and April 2008. These data encompass the two-, and three-telescope commissioning phases, as well as observations with the full four-telescope array. \objectname{1ES 0806+524} is detected with a statistical significance of 6.3 standard deviations from 245 excess events. Little or no measurable variability on...
Source: http://arxiv.org/abs/0812.0978v1
