2008MNRAS.385.1628P -
Mon. Not. R. Astron. Soc., 385, 1628-1634 (2008/April-2)
GeV emission from gamma-ray burst afterglows.
PANAITESCU A.
Abstract (from CDS):
We calculate the GeV afterglow emission expected from a few mechanisms related to gamma-ray bursts (GRBs) and their afterglows. Given the brightness of the early X-ray afterglow emission measured by Swift/X-Ray Telescope, Gamma-ray Large Area Space Telescope (GLAST)/Large Area Telescope (LAT) should detect the self-Compton emission from the forward shock driven by the GRB ejecta into the circumburst medium. Novel features discovered by Swift in X-ray afterglows (plateaus and chromatic light-curve breaks) indicate the existence of a pair-enriched, relativistic outflow located behind the forward shock. Bulk and inverse-Compton upscattering of the prompt GRB emission by such outflows provide another source of GeV afterglow emission detectable by LAT. The large-angle burst emission and synchrotron forward-shock emission are, most likely, too dim at high photon energy to be observed by LAT. The spectral slope of the high-energy afterglow emission and its decay rate (if it can be measured) allow the identification of the mechanism producing the GeV transient emission following GRBs.
Abstract Copyright:
©2008 The Author. Journal compilation © 2008 RAS
Journal keyword(s):
radiation mechanisms: non-thermal - shock waves - gamma-rays: bursts
Simbad objects:
1
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