van der Horst 2009 光学亮暴和暗暴的分类新方法

主要内容:
用两个参数，x射线的谱 beta_x 和 x与光学之间的谱指数 beta_ox. 如果beta_ox .lt. beta_x-0.5, 就算暗暴。
(n_nu ~ nu^-beta)

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Title:		Optical Classification of Gamma-Ray Bursts in the Swift Era
Authors:		van der Horst, A. J.; Kouveliotou, C.; Gehrels, N.; Rol, E.; Wijers, R. A. M. J.; Cannizzo, J. K.; Racusin, J.; Burrows, D. N.
Publication:		eprint arXiv:0905.0524
Publication Date:		05/2009
Origin:		ARXIV
Keywords:		Astrophysics - High Energy Astrophysical Phenomena
Comment:		6 pages, 3 figures; accepted for publication in ApJ
Bibliographic Code:		2009arXiv0905.0524V

Abstract

We propose a new method for the classification of optically dark gamma-ray bursts (GRBs), based on the X-ray and optical-to-X-ray spectral indices of GRB afterglows, and utilizing the spectral capabilities of Swift. This method depends less on model assumptions than previous methods, and can be used as a quick diagnostic tool to identify optically sub-luminous bursts. With this method we can also find GRBs that are extremely bright at optical wavelengths. We show that the previously suggested correlation between the optical darkness and the X-ray/gamma-ray brightness is merely an observational selection effect.

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