Computer Science
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aipc..906...51g&link_type=abstract
GAMMA-RAY BURSTS: PROSPECTS FOR GLAST: Stockholm Symposium on GRB's. AIP Conference Proceedings, Volume 906, pp. 51-58 (2007).
Computer Science
Gamma-Ray Sources, Gamma-Ray Bursts, X-Ray, Flares
Scientific paper
Observations are showing that X-ray flares are very common features in Gamma-Ray Burst light curves. X-ray flares occur from hundred to thousands of seconds after the burst, when the prompt-to-afterglow transition takes place. Flares present a variety of spectral and temporal behaviours, thus several models have been proposed in the literature to explain this phenomenon. In particular we study flares in the framework of external shocks. In this context X-ray flares are produced by synchrotron emission as thick shell fireballs collide with the external medium and represent the onset of the afterglow emission. The X-ray flare photons are expected to be Inverse Compton (IC) scattered by the afterglow electrons producing high energy counterparts that potentially will be detected by the Large Area Telescope on board GLAST. The existence of high energy flares is supported by the delayed GeV emission detected by EGRET in GRB 940217. We investigate the contribution of the IC emission associated with X-ray flares in the MeV-GeV band in view of the launch of the GLAST satellite. Observations with GLAST LAT will give useful information to test models and to constrain the origin of X-ray flares.
Barbiellini Guido
Galli Alessandra
Longo Francesco
Omodei Nicola
Piro Luigi
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