Interaction of GRB Fireballs with Ambient Medium

Details Interaction of GRB Fireballs with Ambient Medium Interaction of GRB Fireballs with Ambient Medium

2003-05-08

arxiv.org/abs/astro-ph/0305118v1

Astronomy and Astrophysics

Astrophysics

12 pages, invited talk at Niels Bohr Summer Institute, "Beaming and Jets in Gamma Ray Bursts"

Scientific paper

The customary picture of the fireball deceleration by an external medium neglects two physical agents in the problem that are important at radii R<10^{17} cm: a radiative precursor (the prompt GRB) and a relativistic front of free neutrons. The radiative precursor preaccelerates the medium and loads it with e+- pairs. This provides a new explanation for the early optical flashes in GRBs. The front of free neutrons must form in a standard baryonic fireball and change the mechanism of the fireball deceleration. The neutron effect, however, disappears if the fireball is strongly dominated by the Poynting flux. The neutrons thus provide a unique link between the progenitor physics and the observed external blast wave. The explosion mechanism at R<10^{17} cm is testable with upcoming observations of early afterglows.

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