Gamma-ray burst: evolution of the fireball and afterglow

Astronomy and Astrophysics – Astronomy

Scientific paper

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Gamma-Ray Burst (Grb), Fireball, Evolution, Afterglow

Scientific paper

After the main part of a GRB, its fireball continuously expands. With the hydrodynamic equations for the postburst fireball, the authors study the distribution of electrons which changes with time. The equations are solved numerically and the relations of the flux density of Optical afterglow in R band as well as the X-ray afterglow with time have been obtained. The results fit the observations quite well. Finally the shortcomings of the fireball + blast model are discussed.

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