Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-12-08
Astronomy and Astrophysics
Astrophysics
13 pages, 10 figures; to appear in Proc. of GeV-TeV Gamma-Ray Astrophysics Workshop: Toward a Major Atmospheric Cherenkov Tele
Scientific paper
10.1063/1.1291372
Gamma-ray burst (GRB) engines are probed most intimately during the prompt gamma-ray luminous phase when the expanding blast wave is closest to the explosion center. Using GRBs 990123 and 940217 as guides, we briefly review observations of high-energy emission from GRBs and summarize some problems in GRB physics. \gamma\gamma transparency arguments imply relativistic beaming. The parameters that go into the external shock model are stated, and we show numerical simulation results of gamma-ray light curves from relativistic blast waves with different amounts of baryon loading. A distinct component due to the synchrotron self-Compton process produces significant emission at GeV and TeV energies. Predictions for spectral and temporal evolution at these energies are presented for a blast wave expanding into uniform surroundings. Observations of the slow decay of GeV-TeV radiation provide evidence for ultra-high energy cosmic ray acceleration in GRBs.
Chiang James
Dermer Charles D.
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