Some Theoretical Implications of Short-Hard Gamma-Ray Burst observations

Ehud Nakar

doi:10.1016/j.asr.2006.12.038

paper

Some Theoretical Implications of Short-Hard Gamma-Ray Burst observations

arXiv:astro-ph/0703129 · doi:10.1016/j.asr.2006.12.038

Abstract

Short-hard and long-soft gamma-ray bursts (GRBs) are two distinct phenomena, but their prompt and afterglow emission show many similarities. This suggests that two different progenitor systems lead to similar physical processes and that the prompt and afterglow observations of short-hard GRBs (SHBs) can be examined using models of long GRBs. Here, I discuss three conclusions that can be drawn from SHB observations. I show that the lower limit on the Lorentz factor of SHBs is typically ``only'' 10-50, significantly lower than that of long GRBs. SHBs with observed X-ray afterglow after 1 day are found to be roughly as efficient as long GRBs in converting the outflow energy into prompt gamma-rays. Finally, I examine the origin of SHBs with X-ray dark afterglows and find that the most plausible explanation is that these SHBs exploded in extremely low density environment ( $n ≲ 1 0^{- 5} c m^{- 3}$ )

arXiv comment9 pages, 2 figures; Proceedings of the 36th COSPAR Scientific Assembly, 2006, Beijing, China. Advances in Space Research in press

Some Theoretical Implications of Short-Hard Gamma-Ray Burst observations

Abstract

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