Nardini, M. 2009 伽玛暴余辉的亮,暗暴之分

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不是选择效应, 应该有内在的原因.

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Title:		The puzzling clustering and bimodality of long GRBs optical afterglow luminosities
Authors:		Nardini, M.; Ghisellini, G.; Ghirlanda, G.
Publication:		eprint arXiv:0907.5426
Publication Date:		07/2009
Origin:		ARXIV
Keywords:		Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Cosmology and Extragalactic Astrophysics
Comment:		2 pages, 2 figures. Proceeding of the 44th Rencontres de Moriond "Very High Energy Phenomena in the Universe"
Bibliographic Code:		2009arXiv0907.5426N

Abstract

The study of the rest frame properties of long Gamma-Ray bursts (GRBs) afterglows is a fundamental aspect for a better understanding of the nature of these powerful explosions. The launch of the Swift satellite (November 2004) marked a strong improvement of the observational capabilities of X-rays and optical afterglows. We studied the intrinsic optical afterglows of a sample of long GRBs finding an unexpected clustering and a hint of bimodality of the optical luminosity distribution (at 12h after the trigger). Through a Montecarlo simulation we proved that both the observed clustering and bimodality are not simply due to selection effects but should hide important information in the understanding of the nature of the afterglow emission. These findings can shed also light on the nature of the large fraction of optically dark GRBs.

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