Starling 2008 GRB 080721的观测

主要内容:
虽然打着这个暴的总能量的牌子, 但实际上就是给出这个暴的观测. 能量本身多少也不重要(不是很多也不是很少).

貌似观测的文章不能只是给一下观测, 总得说点儿啥, 不然不好发表.

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Title:		Constraining the energy budget of GRB 080721
Authors:		Starling, R. L. C.; Rol, E.; van der Horst, A. J.; Yoon, S. -C.; Pal'shin, V.; Ledoux, C.; Page, K. L.; Fynbo, J. P. U.; Wiersema, K.; Tanvir, N. R.; Jakobsson, P.; Guidorzi, C.; Curran, P. A.; Levan, A. J.; O'Brien, P. T.; Osborne, J. P.; Svinkin, D.; de Ugarte Postigo, A.; Oosting, T.
Publication:		eprint arXiv:0812.2490
Publication Date:		12/2008
Origin:		ARXIV
Keywords:		Astrophysics
Comment:		11 pages, 6 figures, submitted to MNRAS
Bibliographic Code:		2008arXiv0812.2490S

Abstract

We follow the bright, highly energetic afterglow of Swift-discovered GRB 080721 out to 36 days or 3e6 s since the trigger in the optical and X-ray bands. We do not detect a break in the late-time light curve inferring a limit on the opening angle of theta_j >= 7.22 deg and setting tight constraints on the total energy budget of the burst of E_gamma >= 9.88e51 erg within the fireball model. To obey the fireball model closure relations the GRB jet must be expanding into a homogeneous surrounding medium. The energy constraint we derive can be used as observational input for models of the progenitors of long gamma-ray bursts: we discuss how such high collimation-corrected energies could be accommodated with certain parameters of the standard massive star core-collapse models. We can, however, most probably rule out a magnetar progenitor for this GRB which would require 100% efficiency to reach the observed total energy.

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