Fermi Observations of GRB 090902B: A Distinct Spectral Component in the Prompt and Delayed Emission
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DOIAbstract
Accepted for publication in ApJ Letters. Contact Authors: Elisabetta Bissaldi (ebs@mpe.mpg.de), James Chiang (jchiang@slac.stanford.edu), Francesco de Palma (francesco.depalma@ba.infn.it), Sheila McBreen (smcbreen@mep.mpg.de)We report on the observation of the bright, long gamma-ray burst, GRB 090902B, by the Gamma-ray Burst Monitor (GBM) and Large Area Telescope (LAT) instruments on-board the Fermi observatory. This was one of the brightest GRBs to have been observed by the LAT, which detected several hundred photons during the prompt phase. With a redshift of z = 1.822, this burst is among the most luminous detected by Fermi. Time-resolved spectral analysis reveals a significant power-law component in the LAT data that is distinct from th...
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