GRB 030226 in a Density-Jump Medium

Details GRB 030226 in a Density-Jump Medium GRB 030226 in a Density-Jump Medium

Publishing date

2003-05-22

URL

arxiv.org/abs/astro-ph/0305426v1

Journals

Astrophys.J. 591 (2003) L21-L24

Science

Astronomy and Astrophysics

Field

Astrophysics

Additional info

9 pages, 1 figure, accepted for publication in ApJ Letters

Type

Scientific paper

Digital Object Identifier

10.1086/377037

Abstract

We present an explanation for the unusual temporal feature of the GRB 030226 afterglow. The R-band afterglow of this burst faded as ~ t^{-1.2} in ~ 0.2 days after the burst, rebrightened during the period of ~ 0.2 - 0.5 days, and then declined with ~ t^{-2.0}. To fit such a light curve, we consider an ultrarelativistic jetted blast wave expanding in a density-jump medium. The interaction of the blast wave with a large density jump produces relativistic reverse and forward shocks. In this model, the observed rebrightening is due to emissions from these newly forming shocks, and the late-time afterglow is caused by sideways expansion of the jet. Our fitting implies that the progenitor star of GRB 030226 could have produced a stellar wind with a large density jump prior to the GRB onset.

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