The high energy behavior of Gamma-ray Burst spectra as observed by Fermi GBM and LAT

Péter Veres, Péter Mészáros

Research output: Contribution to journalConference article

Abstract

Most Fermi GRB spectra appear as either a broken power law extending to GeV energies or as a broken power with a separate GeV power law component. Here we show that such spectra can be understood in terms of magnetically dominated relativistic jets where a dissipative photosphere produces the prompt MeV emission, which is extended into the GeV range by inverse Compton scattering in the external shock, with possible contributions from a reverse shock as well. The bulk Lorentz factors required in these models are in the range of 300-600, and the MeV-GeV time delays arise naturally. In some cases an optical flash and a sub-dominant thermal component are also present.

Original languageEnglish (US)
JournalProceedings of Science
Volume2012-May
StatePublished - Jan 1 2012
Event2012 Gamma-Ray Bursts Conference, GRB 2012 - Munich, Germany
Duration: May 7 2012May 11 2012

All Science Journal Classification (ASJC) codes

  • General

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