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

E. Aliu, S. Archambault, T. Aune, W. Benbow, K. Berger, R. Bird, A. Bouvier, J. H. Buckley, V. Bugaev, K. Byrum, M. Cerruti, X. Chen, L. Ciupik, M. P. Connolly, W. Cui, J. Dumm, M. Errando, A. Falcone, S. Federici, Q. FengJ. 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 Faoláin De Bhróithe, R. A. Ong, A. N. Otte, N. Park, 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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Abstract

In 2013 March, a flaring episode from the Crab Nebula lasting 2 weeks was detected by Fermi-LAT (Large Area Telescope on board the Fermi Gamma-ray Space Telescope). The Very Energetic Radiation Imaging Telescope Array System (VERITAS) provides simultaneous observations throughout this period. During the flare, 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.

Original languageEnglish (US)
Article numberL11
JournalAstrophysical Journal Letters
Volume781
Issue number1
DOIs
StatePublished - 2014

Keywords

  • ISM: individual objects (Crab Nebula)
  • gamma rays: general

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    Aliu, E., Archambault, S., Aune, T., Benbow, W., Berger, K., Bird, R., Bouvier, A., Buckley, J. H., Bugaev, V., Byrum, K., Cerruti, M., Chen, X., Ciupik, L., Connolly, M. P., Cui, W., Dumm, J., Errando, M., Falcone, A., Federici, S., ... Zitzer, B. (2014). A search for enhanced very high energy gamma-ray emission from the 2013 March Crab Nebula flare. Astrophysical Journal Letters, 781(1), [L11]. https://doi.org/10.1088/2041-8205/781/1/L11