Models and Understanding of GRBs

Mathematics – Logic

Scientific paper

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Scientific paper

Models of gamma-ray bursts must account for the fact that at cosmological distances the energy requirements are comparable to those of a supernova, and while in most cases the energy appears briefly in gamma-rays, in some cases a substantial fraction of the energy follows in an afterglow at longer wavelengths. Cosmological fireball models where the radiation is produced in shocks have been successful in addressing the overall characteristics of the bursts, and in fact afterglows were predicted in advance of observations. There are a number of interesting physics questions related to such models, and a fruitful interplay between theory and observations is developing. We discuss some of the latest developments in the phenomenology of bursts both at gamma-ray and softer energies, and the way these are being used to constrain and refine the basic models and assumptions.

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