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Global Properties of High-Energy Emission from Gamma-Ray Bursts

  • N. Omodei (a1), G. Vianello (a1), F. Piron (a2), V. Vasileiou (a2), S. Razzaque (a3) and the Fermi Large Area Telescope collaboration...

Abstract

In three years of observations the Large Area Telescope (LAT) on board the Fermi Gamma Ray Space Telescope has observed high-energy γ-ray emission from 35 gamma-ray bursts (GRBs). The first Fermi-LAT catalog of GRBs is in preparation within the Fermi LAT collaboration and will provide a systematic study of high-energy emission from GRBs. In this paper we present some of the main results, briefly discussing durations, energetics, time-resolved and time integrated LAT spectral analysis. We also discuss characteristics of LAT-detected emission such as its delayed onset and longer duration compared to emission detected by the GBM, and its power-law temporal decay at late times.

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