On the Shallow Decay of Some GRB Afterglows

Details On the Shallow Decay of Some GRB Afterglows On the Shallow Decay of Some GRB Afterglows

2004-02-05

arxiv.org/abs/astro-ph/0402119v1

Astronomy and Astrophysics

Astrophysics

5 pages, to appear in Proc. of 2003 GRB Santa Fe Conference, this is a very short version of astro-ph/0308273

Scientific paper

10.1063/1.1810886

Half of the radio afterglows for which there is a good temporal coverage exhibit after 10 days from the burst a decay which is shallower than at optical frequencies, contrary to what is expected within the simplest form of the standard model of relativistic fireballs or jets. We investigate possible ways to decouple the radio and optical decays. First, the radio and optical emissions are assumed to arise from the same electron population and we allow for either a time-varying slope of the power-law distribution of electron energy or for time-varying microphysical parameters. Then we consider two scenarios where the radio and optical emissions arise in distinct parts of the GRB outflow, either because the outflow has an angular structure or because there is a long-lived reverse shock. We find that the only the last scenario is compatible with the observations.

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