Prompt High Energy $γ$-Ray Emission From the Synchrotron Self-Compton Process in the Reverse Shocks of $γ$-Ray Bursts

Details Prompt High Energy $γ$-Ray Emission From the Synchrotron Self-Compton Process in the Reverse Shocks of $γ$-Ray Bursts Prompt High Energy $γ$-Ray Emission From the Synchrotron Self-Compton Process in the Reverse Shocks of $γ$-Ray Bursts

2000-10-17

arxiv.org/abs/astro-ph/0010320v1

Astrophys.J. 546 (2001) L33-L38

Astronomy and Astrophysics

Astrophysics

11 pages, latex, accepted to be published in Ap.J.Letters

Scientific paper

10.1086/318064

In the standard scenario of the fireball model of gamma-ray bursts(GRBs), the huge initial energy release produces a relativistic blast wave expanding into the external medium and a reverse shock moving into and heating the fireball ejecta. We calculate the high energy gamma-ray emission due to inverse Compton scattering of the synchrotron photons from relativistic electrons in the reverse shock. Under the favorable values of the physical parameters of the GRBs and the interstellar medium, our result shows that during the prompt phase, this emission dominates over the component from the forward shock at high energy gamma-ray bands. This mechanism can excellently account for the observations of the prompt high energy gamma-rays detected by EGRET, such as from GRB930131.

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