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2004MNRAS.353..511P - Mon. Not. R. Astron. Soc., 353, 511-522 (2004/September-2)
Analysis of two scenarios for the early optical emission of the gamma-ray burst afterglows 990123 and 021211.
PANAITESCU A. and KUMAR P.
Abstract (from CDS):
We determine the shock microphysical parameters, ejecta kinetic energy and circumburst density, which accommodate the radio and optical measurements of the GRB afterglows 990123 and 021211. We find that, for a homogeneous medium, the radio and optical emissions of the afterglow 990123 can be accommodated by the reverse-forward shock scenario if the microphysical parameters behind the two shocks differ substantially. A wind-like circumburst medium also allows the reverse-forward shock scenario to account for the radio and optical properties of the afterglows 990123 and 021211, but the required wind densities are at least 10 times smaller than those of Galactic Wolf-Rayet stars. The wind-bubble scenario requires a variation of the microphysical parameters when the afterglow fireball reaches the wind termination shock, which seems a contrived feature.
Abstract Copyright: 2004 RAS
Journal keyword(s): hydrodynamics - plasmas - radiation mechanisms: non-thermal - shock waves - ISM: jets and outflows - gamma-rays: bursts
CDS comments: Page 521, GRB 011211 is a misprint for 011121.
Simbad objects: 4
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