Horvath 2010 伽马暴还是分三类

主要内容:
长暴、短暴和中间类型。这次是增加了样本。

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Title:		Detailed Classification of Swift's Gamma-Ray Bursts
Authors:		Horvath, I; Bagoly, Z; Balazs, LG; de Ugarte Postigo, A; Veres, P; Meszaros, A
Publication:		eprint arXiv:1003.0632
Publication Date:		03/2010
Origin:		ARXIV
Keywords:		Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Cosmology and Extragalactic Astrophysics
Comment:		Accepted for publication in The Astrophysical Journal
Bibliographic Code:		2010arXiv1003.0632H

Abstract

Earlier classification analyses found three types of gamma-ray bursts (short, long and intermediate in duration) in the BATSE sample. Recent works have shown that these three groups are also present in the RHESSI and the BeppoSAX databases. The duration distribution analysis of the bursts observed by the Swift satellite also favors the three-component model. In this paper, we extend the analysis of the Swift data with spectral information. We show, using the spectral hardness and the duration simultaneously, that the maximum likelihood method favors the three-component against the two-component model. The likelihood also shows that a fourth component is not needed.

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