High Energy Afterglow from Gamma-ray Bursts

Abstract

We calculate the very high energy (sub-GeV to TeV) inverse Compton emission of GRB afterglows. We argue that this emission provides a powerful test of the currently accepted afterglow model. We focus on two processes: synchrotron self-Compton (SSC) emission within the afterglow blast wave, and external inverse Compton (EIC) emission which occurs when flare photons (produced by an internal process) pass through the blast wave. We show that if our current interpretations of the Swift XRT data are correct, there should be a canonical high energy afterglow emission light curve. Our predictions can be tested with high energy observatories such as GLAST, Whipple, H.E.S.S. and MAGIC. Under favorable conditions we expect afterglow detections in all these detectors.

15 pages, 15 eps figures and 1 table, slightly modified version to appear in MNRAS. Fig.12 is added to illustrate the difference of the EIC emission lightcurves with and without the anisotropic correction in the comoving frame of the blast wave

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