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The extended high-energy gamma-ray (>100 MeV) emission occurring after theprompt gamma-ray bursts (GRBs) is usually characterized by a single power-lawspectrum, which has been explained as the afterglow synchrotron radiation. Wereport on the Fermi Large Area Telescope (LAT) observations of the >100 MeVemission from the very bright and nearby GRB 130427A, up to ~100 GeV. Byperforming time-resolved spectral fits of GRB 130427A, we found a strongevidence of an extra hard spectral component above a few GeV that exists in theextended high-energy emission of this GRB. This extra spectral component mayrepresent the first clear evidence of the long sought-after afterglow inverseCompton emission. Prospects for observations at the very high-energygamma-rays, i.e., above 100 GeV, are described.

international journal of modern physics. conference series

The Very Bright and Nearby GRB 130427A: The Extra Hard Spectral  Component and Implications for Very High-energy Gamma-ray Observations of  Gamma-ray Bursts