GRB afterglows from long-lived reverse shocks

Details GRB afterglows from long-lived reverse shocks GRB afterglows from long-lived reverse shocks

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1065..143d&link_type=abstract

2008 NANJING GAMMA-RAY BURST CONFERENCE. AIP Conference Proceedings, Volume 1065, pp. 143-148 (2008).

Computer Science

Sound

Gamma-Ray Sources, Gamma-Ray Bursts, Macrosonic Propagation, Finite Amplitude Sound, Shock Waves, Space-Based Ultraviolet, Optical, And Infrared Telescopes, Plasma Reactions

Scientific paper

GRB afterglows are usually associated to the emission of the forward shock propagating in the external medium when the ultra-relativistic outflow is decelerated. However, it is difficult for this model to reproduce some of Swift observations, especially in the early afterglow phase. We discuss a modified scenario [1, 2] where the forward shock is radiatively inefficient in the ultra-relativistic phase, and where the afterglow is produced by the reverse shock propagating within the relativistic outflow itself. To reproduce the observed duration of the afterglow, the reverse shock has to be long-lived, which is possible if the ultra-relativistic part of the outflow is followed by a tail of material with smaller Lorentz factors.

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