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A luminous and isolated gamma-ray flare from the blazar B2 1215+30

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arxiv 1701.01067 v1 pith:JAQTMSLM submitted 2017-01-04 astro-ph.HE

A luminous and isolated gamma-ray flare from the blazar B2 1215+30

VERITAS Collaboration: A. U. Abeysekara , S. Archambault , A. Archer , W. Benbow , R. Bird , M. Buchovecky , J. H. Buckley , V. Bugaev
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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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classification astro-ph.HE
keywords blazarflarefluxdetectedgamma-rayhighluminosityobservations
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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. Multiwavelength observations with Fermi-LAT, Swift, and the Tuorla observatory revealed a correlated high GeV flux state and no significant optical counterpart to the flare, with a spectral energy distribution where the gamma-ray luminosity exceeds the synchrotron luminosity. When interpreted in the framework of a one-zone leptonic model, the observed emission implies a high degree of beaming, with Doppler factor > 10, and an electron population with spectral index < 2.3.

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