Wind Interaction Models for the Afterglows of GRB 991208 and GRB 000301C

Details Wind Interaction Models for the Afterglows of GRB 991208 and GRB 000301C Wind Interaction Models for the Afterglows of GRB 991208 and GRB 000301C

2000-10-15

arxiv.org/abs/astro-ph/0010288v1

Astronomy and Astrophysics

Astrophysics

17 pages, submitted to ApJ

Scientific paper

10.1086/320239

The simplest model of the afterglows of the gamma-ray bursts (GRBs) envisions a spherical blast wave with a power-law distribution of electron energy above some cutoff running into a constant density medium. A refinement involves a narrow jet, often invoked to explain the steep decline and/or steepening of light curves observed in some afterglows. The constant (ambient) density jet model has been applied to GRBs 991208 and 000301C, based to a large extent on radio observations. We show that, for these two sources, a spherical wind model (with an $r^{-2}$ density ambient medium) can fit the radio data as well as the jet model. %%We demonstrate that the The relatively steep decline and the fairly abrupt steepening of the R-band light curves of, respectively, GRB 991208 and GRB 000301C can be accounted for with a non-standard, broken power-law distribution of electron energy. Our model predicts a slower late decline for the radio flux than does the jet model.

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