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On the Properties of Spectral Lags and Peak-Count Rates ofRHESSI Gamma-Ray Bursts

Published online by Cambridge University Press:  22 July 2013

J. Řípa ,
A. Mészáros ,
P. Veres  and
I.H. Park
J. Řípa
Affiliation:
Institute of Basic Science, Sungkyunkwan University, Suwon, South Korea;. e-mail: [email protected]
A. Mészáros
Affiliation:
Astronomical Institute of the Charles University, Prague, Czech Republic
P. Veres
Affiliation:
Department of Astronomy and Astrophysics, Penn. State University, State College, USA
I.H. Park
Affiliation:
Institute of Basic Science, Sungkyunkwan University, Suwon, South Korea;. e-mail: [email protected]
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Abstract

A sample of 427 gamma-ray bursts (GRBs) was observed by the RHESSIsatellite in Feb. 2002 - Apr. 2008. We calculated spectral lags and peak-countrates for the first time and constructed a new observational database. This database isstatistically studied completing an earlier analysis of durations and hardness ratios.First, we discuss properties of short-, intermediate-, and long-duration GRBs in terms ofpeak-count rates and spectral lags. Second, we investigate the number of GRB groups usingmodel-based clustering method together with Kolmogorov-Smirnov (K-S) and Anderson-Darling(A-D) tests. The results are: The inter. bursts have properties similar to short bursts.The groups of inter. and long bursts appear to be different. The inter. GRBs in theRHESSI and Swift databases seem to be differentphenomena. This work is summary of Řípa et al. (2012).

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 61: Gamma-ray Bursts: 15 Years of GRB Afterglows – Progenitors, Environments and Host Galaxies from the Nearby to the Early Universe , 2013 , pp. 79 - 81
Copyright
© EAS, EDP Sciences 2013

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References

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