GRB 060418 and 060607A: the medium surrounding the progenitor and the weak reverse shock emission

Details GRB 060418 and 060607A: the medium surrounding the progenitor and the weak reverse shock emission GRB 060418 and 060607A: the medium surrounding the progenitor and the weak reverse shock emission

2007-01-25

arxiv.org/abs/astro-ph/0701715v2

Mon.Not.Roy.Astron.Soc.378:1043-1048,2007

Astronomy and Astrophysics

Astrophysics

7 pages including 3 eps figures. Expanded version to appear in MNRAS main Journal. References added. Main conclusions are unch

Scientific paper

10.1111/j.1365-2966.2007.11836.x

We constrain the circum-burst medium profile with the rise behavior of the very early afterglow light curves of gamma-ray bursts (GRBs). Using this method, we find a constant and low-density medium profile for GRB 060418 and GRB 060607A, which is consistent with the inference from the late afterglow data. In addition, we show that the absence of the IR flashes in these two GRB afterglows is consistent with the standard external reverse shock model, which thus renders models like the highly magnetized GRB outflow being unnecessary to a certain extent.

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