Inverse Compton X-ray Flare from GRB Reverse Shock

Details Inverse Compton X-ray Flare from GRB Reverse Shock Inverse Compton X-ray Flare from GRB Reverse Shock

2005-06-08

arxiv.org/abs/astro-ph/0506157v2

Astrophys.J.655:391-395,2007

Astronomy and Astrophysics

Astrophysics

14 pages, 3 figures, accepted for publication in ApJ

Scientific paper

10.1086/510198

We study synchrotron self-inverse Compton radiation from a reverse-shocked fireball. If the inverse Compton process dominates the cooling of shocked electrons, an X-ray flare produced by the first order Compton scattering would emerge in the very early afterglow phase, with the bulk of the shock energy radiated in the second order scattering component at 10-100 MeV. The dominance of inverse Compton cooling leads to the lack of prompt optical flashes. We show that for plausible parameters this scattering process can produce an X-ray flare with a relative amplitude change by a factor of several. Flares with a larger amplitude and multiple X-ray flares in a single event are likely to be produced by another mechanism (e.g. internal shocks).

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