Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-04-17
Mon.Not.Roy.Astron.Soc.373:729-732,2006
Astronomy and Astrophysics
Astrophysics
10 pages, 3 figures, accepted for publication in MNRAS
Scientific paper
10.1111/j.1365-2966.2006.11058.x
In this paper, we restudy the spectral lag features of short bright gamma-ray bursts (T90 < 2.6s) with a BATSE time-tagged event (TTE) sample including 65 single pulse bursts. We also make an investigation on the characteristics of ratios between the spectral lag and the full width at half maximum ($FWHM$) of the pulses, called relative spectral lags (RSLs). We draw the conclusions as follows: 1) Spectral lags of short GRBs are normally distributed and concentrated on around the value of 0.014 with 40 percent of them having negative lags. With K-S test, we find the lag distribution is identical with a normal one caused by white noises, which indicates the lags of the vast majority of short bursts are so small that they are negligible as Norris et al. have suggested.
Deng Jia-Gan
Jin Wenlong
Xie G.-Zh.
Zhang Zhibin
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