Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2009-08-27
Astrophys.J. 706: L33-L36, 2009
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
5 pages; accepted for publication in ApJL
Scientific paper
We constrain the physical composition of the outflows of GRBs 080916C and 090510 with the prompt emission data and find that the former is likely magnetic while the latter may be baryonic. The X-ray and optical afterglow emission of both GRBs can be reasonably fitted using the standard external shock model but the density profiles of the circum-burst medium are different. We also propose a simple method to estimate the number of the seed photons suppose the GeV afterglow photons are due to the inverse Compton radiation of external forward shock electrons. The seed photons needed in the modeling are too many to be realistic for both events. The synchrotron radiation of the forward shock seems able to account for the GeV afterglow data.
Fan Yi-Zhong
Gao Wei-Hong
Mao Jirong
Xu Dong
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