Sakamoto 2007 短暴真的硬些吗？

主要内容:
（一篇短文）分析了四个有余辉观测的GRBs（GRB 050509b, GRB 050709, GRB 050724, and GRB 050813），发现虽然BATSE所观测的短暴都比其他仪器 Konus-Wind and HETE-2， and swift所观测谱要硬些。分析原因可能是BATSE所观测的谱指数\alpha要大些，而不是E_peak高些。

精彩摘抄:


文章信息:
Are Short GRBs Really Hard?

Authors: T. Sakamoto, L. Barbier, S. Barthelmy, J. Cummings, E. Fenimore, N. Gehrels, D. Hullinger, H. Krimm, C. Markwardt, D. Palmer, A. Parsons, G. Sato, J. Tueller, R. Aptekar, T. Cline, S. Golenetskii, E. Mazets, V. Pal'shin, G. Ricker, D. Lamb, J.-L. Atteia, N. Kawai

(Submitted on 30 May 2006)

Abstract: Thanks to the rapid position notice and response by HETE-2 and Swift, the X-ray afterglow emissions have been found for four recent short gamma-ray bursts (GRBs; GRB 050509b, GRB 050709, GRB 050724, and GRB 050813). The positions of three out of four short GRBs are coincident with galaxies with no current or recent star formation. This discovery tightens the case for a different origin for short and long GRBs. On the other hand, from the prompt emission point of view, a short GRB shows a harder spectrum comparing to that of the long duration GRBs according to the BATSE observations. We investigate the prompt emission properties of four short GRBs observed by Swift/BAT. We found that the hardness of all four BAT short GRBs is in between the BATSE range for short and long GRBs. We will discuss the spectral properties of short GRBs including the short GRB sample of Konus-Wind and HETE-2 to understand the hard nature of the BATSE short GRBs.

Comments:

5 pages, 8 figures. To appear in the proceedings of "Gamma Ray Bursts in the Swift Era", eds. S. Holt, N. Gehrels & J. Nousek

Subjects:

Astrophysics (astro-ph)

Cite as:

arXiv:astro-ph/0605717v1