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Fermi Large Area Telescope observations of GRB 110625A
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Fermi Large Area Telescope observations of GRB 110625A
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Fermi Large Area Telescope observations of GRB 110625A
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Paper
Fermi Large Area Telescope observations of GRB 110625A
2012
Overview
Gamma-ray bursts (GRBs) that emit photons at GeV energies form a small but significant population of GRBs. However, the number of GRBs whose GeV-emitting period is simultaneously observed in X-rays remains small. We report gamma-ray observations of GRB 110625A using Fermi's Large Area Telescope (LAT) in the energy range 100 MeV to 20 GeV. Gamma-ray emission at these energies was clearly detected using data taken between 180s and 580s after the burst, an epoch after the prompt emission phase. The GeV light curve differs from a simple power-law decay, and probably consists of two emission periods. Simultaneous Swift/XRT observations did not show flaring behaviors as in the case of GRB 100728A. We discuss the possibility that the GeV emission is the synchrotron self-Compton radiation of underlying ultraviolet flares.
Publisher
Cornell University Library, arXiv.org
Subject
