Single- and two-component gamma-ray burst spectra in the Fermi GBM-LAT energy range

P. Veres, P. Mészáros

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

Most Fermi gamma-ray burst 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)
Article number12
JournalAstrophysical Journal
Volume755
Issue number1
DOIs
StatePublished - Aug 10 2012

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Fingerprint Dive into the research topics of 'Single- and two-component gamma-ray burst spectra in the Fermi GBM-LAT energy range'. Together they form a unique fingerprint.

Cite this