High-energy gamma-rays from GRB X-ray flares

X. Y. Wang, Z. Li, P. Mészáros

Research output: Chapter in Book/Report/Conference proceedingConference contribution


The recent detection of X-ray flares during the afterglow phase of gamma-ray bursts (GRBs) suggests an inner-engine origin, at radii inside the forward shock. There must be inverse Compton (IC) emission arising from such flare photons scattered by forward shock afterglow electrons when they are passing through the forward shock. We find that this IC emission produces high energy gamma-ray flares, which may be detected by AGILE, GLAST and ground-based TeV telescopes. The anisotropic IC scattering between flare photons and forward shock electrons does not affect the total IC component intensity, but cause a time delay of the IC component peak relative to the flare peak. We speculate that this IC component may already have been detected by EGRET from a very strong burst - GRB940217. Future observations by GLAST may help to distinguish whether X-ray flares originate from late central engine activity or from external shocks.

Original languageEnglish (US)
Title of host publicationFirst GLAST Symposium
Number of pages3
StatePublished - 2007
Event1st Gamma-ray Large Area Space Telescope Symposium, GLAST - Stanford, CA, United States
Duration: Feb 5 2007Feb 8 2007

Publication series

NameAIP Conference Proceedings
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616


Other1st Gamma-ray Large Area Space Telescope Symposium, GLAST
Country/TerritoryUnited States
CityStanford, CA

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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