Improved Correlation between the Variability and Peak Luminosity of Gamma-Ray Bursts

Details Improved Correlation between the Variability and Peak Luminosity of Gamma-Ray Bursts Improved Correlation between the Variability and Peak Luminosity of Gamma-Ray Bursts

2005-09-26

arxiv.org/abs/astro-ph/0509776v2

Mon.Not.Roy.Astron.Soc.366:219-226,2006

Astronomy and Astrophysics

Astrophysics

9 pages, including 7 figure. Expanded as requested by referee. An error in Fig. 1 was corrected (the two 1-sigma lines in the

Scientific paper

10.1111/j.1365-2966.2005.09836.x

A new procedure for smoothing a gamma-ray burst (GRB) lightcurve and calculating its variability is presented. Applying the procedure to a sample of 25 long GRBs, we have obtained a very tight correlation between the variability and the peak luminosity. The only significant outlier in the sample is GRB 030329. With this outlier excluded, the data scatter is reduced by a factor of \sim 3 compared to that of Guidorzi et al. (2005), measured by the deviation of fit. Possible causes for the outlier are discussed.

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