Comment on "Gamma-ray burst early afterglows: reverse shock emission from an arbitrarily magnetized ejecta" by Zhang and Kobayashi (2004)

Details Comment on "Gamma-ray burst early afterglows: reverse shock emission from an arbitrarily magnetized ejecta" by Zhang and Kobayashi (2004) Comment on "Gamma-ray burst early afterglows: reverse shock emission from an arbitrarily magnetized ejecta" by Zhang and Kobayashi (2004)

2005-03-23

arxiv.org/abs/astro-ph/0503505v1

Astronomy and Astrophysics

Astrophysics

2 pages

Scientific paper

Zhang and Kobayashi (2004) attempted to calculate early afterglow emission from a system of forward and reverse shocks in GRB outflows for the case of magnetized ejecta. We point out a fundamental error in the underlying dynamical model. According to the authors, energy and momentum carried by the magnetic field of the ejecta are not transfered to the forward shock. This is an incorrect assumption that invalidates the results.

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