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 language | English (US) |
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Article number | L11 |
Journal | Astrophysical Journal Letters |
Volume | 781 |
Issue number | 1 |
DOIs | |
State | Published - 2014 |
Keywords
- ISM: individual objects (Crab Nebula)
- gamma rays: general