Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-11-30
Astronomy and Astrophysics
Astrophysics
To appear in "Highlights in X-ray Astronomy", 1998, B. Aschenbach et al, eds., Max Planck Institute for Extraterrestrial Physi
Scientific paper
The successful discovery of X-ray, optical and radio afterglows of gamma-ray bursts has significantly helped our understanding of these sources, and made possible the identification of host galaxies at cosmological distances. The energy release inferred rivals that of supernovae, while its photon energy output may considerably exceed it. Current models envisage this to be the outcome of a cataclysmic stellar event leading to a relativistically expanding fireball, in which particles are accelerated at shocks and produce nonthermal radiation. The substantial agreement between observations and the theoretical predictions of the fireball shock model provide confirmation of the basic aspects of this scenario. The continued observations show a diversity of behavior, providing valuable constraints for more detailed models.
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