X-Ray and high energy flares from late internal shocks of gamma-ray bursts

Details X-Ray and high energy flares from late internal shocks of gamma-ray bursts X-Ray and high energy flares from late internal shocks of gamma-ray bursts

2008-11-07

arxiv.org/abs/0811.1068v1

Astrophys.J.692:133-139,2009

Astronomy and Astrophysics

Astrophysics

18 pages, 7 figures, accepted for publication in ApJ

Scientific paper

10.1088/0004-637X/692/1/133

We study afterglow flares of gamma-ray bursts (GRBs) in the framework of the late internal shock (LIS) model based on a careful description for the dynamics of a pair of shocks generated by a collision between two homogeneous shells,. First, by confronting the model with some fundamental observational features of X-ray flares, we find some constraints on the properties of the pre-collision shells that are directly determined by the central engine of GRBs. Second, high energy emission associated with X-ray flares, which arises from synchrotron self-Compton (SSC) emission of LISs, is investigated in a wide parameter space. The predicted flux of high energy flares may reach as high as $\sim 10^{-8}\rm erg cm^{-2}s^{-1}$, which is likely to be detectable with the Large Area Telescope (LAT) aboard \textit{the Fermi Space Telescope}

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