Burlon 2008 precursor实际上不是precusor

主要内容:
对swift暴的precursor的分析发现它们和暴本身的pulse没有本质的不同，说明它们可能就是暴本身。

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Title:		Precursors in Swift Gamma Ray Bursts with redshift
Authors:		Burlon, D.; Ghirlanda, G.; Ghisellini, G.; Lazzati, D.; Nava, L.; Nardini, M.; Celotti, A.
Publication:		eprint arXiv:0806.3076
Publication Date:		06/2008
Origin:		ARXIV
Keywords:		Astrophysics
Comment:		5 pages, 4 figures, 1 table. Submitted to MNRAS
Bibliographic Code:		2008arXiv0806.3076B

Abstract

We study a sample of Gamma Ray Bursts detected by the Swift satellite with known redshift and that show a precursor in the Swift-BAT light curve. We analyse the spectrum of the precursors and compare them with the time integrated spectrum of the rest of the prompt emission. We find no clear correlation between the two slopes, and no clear tendency for the spectra of the precursors to be systematically harder or softer than the spectra of the prompt. The energetics of the precursors are large: on average, they are less than one order of magnitude dimmer (in the source rest frame energy range 15-150 keV) than the energetics of the entire bursts. These properties do not depend upon the quiescent time between the end of the precursor and the start of the main event. All these results suggest that what we have called "precursor" is not a separated phenomenon, but is tightly connected with the main event, even if, in some cases, the quiescent time between the "precursor" and the main event is longer than 100 seconds.

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