A Possible Explanation for the Radio ``Flare'' in the Early Afterglow of GRB990123

Details A Possible Explanation for the Radio ``Flare'' in the Early Afterglow of GRB990123 A Possible Explanation for the Radio ``Flare'' in the Early Afterglow of GRB990123

1999-03-01

arxiv.org/abs/astro-ph/9903023v1

Astronomy and Astrophysics

Astrophysics

14 pages including 3 figures, submitted to ApJL

Scientific paper

We suggest that the deceleration of the relativistic shock by a denser part of the interstellar medium off line-of-sight produced the observed radio ``flare'' in the early afterglow of GRB990123. We find that this scenario is consistent with observations if the particle number density of this denser part of the medium is between $\sim 200$ and $\sim 2\times 10^4$ cm$^{-3}$. Because of the premature deceleration of part of the shock, the later stage of the afterglow should decay modestly faster than the powerlaw expected from an isotropic shock propagation.

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