http://arxiv.org/abs/1401.7283
GRB 131231A was detected by the Large Area Telescope onboard Fermi Space Gamma-ray Telescope. The high energy gamma-ray ($> 100$ MeV) afterglow emission spectrum is as hard as $F_\nu \propto \nu^{-0.50\pm0.13}$ in the first $\sim 1300$ s after the trigger, and the most energetic photon has an energy $\sim 62$ GeV. Such a hard spectrum is at odds with the model of synchrotron radiation of the external forward shock. Instead, both its spectrum and temporal behavior are found to be consistent with the synchrotron self-Compton radiation of the forward shock-accelerated electrons. We show that the prospect for detecting GRB 131231A-like GRBs with Cherenkov Telescope Array (CTA) is quite promising, and with an exposure time of $\sim 0.5$ hour, the $25$ GeV, $40$ GeV, and $100$ GeV gamma-ray emission of such GRBs could be detected within $1$ hour, $4$ hours, and $12$ hours after the burst, respectively.
Wed, 29 Jan 14
11/52
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