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arxiv: 1309.5949 · v2 · submitted 2013-09-23 · 🌌 astro-ph.HE

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A search for enhanced very high energy gamma-ray emission from the March 2013 Crab Nebula flare

The VERITAS Collaboration: E. Aliu , S. Archambault , T. Aune , W. Benbow , K. Berger , R. Bird , A. Bouvier , J. H. Buckley
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V. Bugaev K. Byrum M. Cerruti X. Chen L. Ciupik M. P. Connolly W. Cui J. Dumm 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 D. Hanna J. Holder G. Hughes T. B. Humensky P. Kaaret M. Kertzman Y. Khassen D. Kieda F. Krennrich S. Kumar M. J. Lang M. Lyutikov G. Maier S. McArthur A. McCann K. Meagher J. Millis P. Moriarty R. Mukherjee A. O'Faolain de Bhroithe R. A. Ong A. N. Otte J. S. Perkins M. Pohl A. Popkow J. Quinn K. Ragan J. Rajotte L. C. Reyes P. T. Reynolds G. T. Richards E. Roache G. H. Sembroski F. Sheidaei A. W. Smith D. Staszak I. Telezhinsky M. Theiling J. V. Tucci J. Tyler A. Varlotta S. P. Wakely T. C. Weekes A. Weinstein R. Welsing D. A. Williams A. Zajczyk B. Zitzer
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classification 🌌 astro-ph.HE
keywords fluxcrabnebulafermi-latsimultaneousaveragechangecorrelation
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In March 2013, a flaring episode from the Crab Nebula lasting ~2 weeks was detected by the Fermi-LAT (Large Area Telescope on board the Fermi Gamma-ray Space Telescope). VERITAS provides simultaneous observations throughout this period. During the flare, the Fermi-LAT detected a 20-fold increase in flux above the average synchrotron flux >100 MeV seen from the Crab Nebula. Simultaneous measurements with VERITAS are consistent with the non-variable long-term average Crab Nebula flux at TeV energies. Assuming a linear correlation between the very-high-energy flux change >1 TeV and the flux change seen in the Fermi-LAT band >100 MeV during the period of simultaneous observations, the linear correlation factor can be constrained to be at most 8.6 * 10^-3 with 95% confidence.

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