McBreen 2008 Spectral lag of GRB 060505

主要内容:
GRB 060614 almost has no spectral time lag, so it can be classified into short burst. But this work find GRB 060505 has lag about 0.36 s, maybe in long bursts category (but without SN component).

精彩摘抄:
可以看到GRB060614 GRB 060505的time lag在不同的区域

文章信息:

· arXiv e-print (arXiv:0803.1919)

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Title:		The Spectral Lag of GRB060505: A Likely Member of the Long Duration Class
Authors:		McBreen, S.; Foley, S.; Watson, D.; Hanlon, L.; Malesani, D.; Fynbo, J. P. U.; Kann, D. A.; Gehrels, N.; McGlynn, S.; Palmer, D.
Publication:		eprint arXiv:0803.1919
Publication Date:		03/2008
Origin:		ARXIV
Keywords:		Astrophysics
Comment:		Accepted by ApJL, 5 pages, 3 Figures
Bibliographic Code:		2008arXiv0803.1919M

Abstract

Two long gamma-ray bursts, GRB 060505 and GRB 060614, occurred in nearby galaxies at redshifts of 0.089 and 0.125 respectively. Due to their proximity and durations, deep follow-up campaigns to search for supernovae (SNe) were initiated. However none were found in either case, to limits more than two orders of magnitude fainter than the prototypical GRB-associated SN, 1998bw. It was suggested that the bursts, in spite of their durations (4 and 102 s), belonged to the population of short GRBs which has been shown to be unrelated to SNe. In the case of GRB 060614 this argument was based on a number of indicators, including the negligible spectral lag, which is consistent with that of short bursts. GRB 060505 has a shorter duration, but no spectral lag was measured. We present the spectral lag measurements of GRB 060505 using Suzakus Wide Area Monitor and the Swift Burst Alert Telescope. We find that the lag is 0.36+/- 0.05 s, inconsistent with the lags of short bursts and consistent with the properties of long bursts and SN-GRBs. These results support the association of GRB 060505 with other low-luminosity GRBs also found in star-forming galaxies and indicates that at least some massive stars may die without bright SNe.

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