Instrumental Selection Effect on the Bimodal T 90 Distribution of Gamma-Ray Bursts

Instrumental Selection Effect on the Bimodal T 90 Distribution of Gamma-Ray Bursts

The durations ( T 90 ) of 315 GRBs detected with Fermi /GBM (8-1000 keV) by 2011 September are calculated using the Bayesian Block method. We compare the T 90 distributions between this sample and that observed with previous/current GRB missions. We show that T 90 is energy-band dependent and the ob...

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Veröffentlicht in:Proceedings of the International Astronomical Union 2012-08, Vol.8 (S290), p.70-73
Hauptverfasser: Qin, Y., Liang, E. W., Virgili, F. J., Zhang, B.
Format: Artikel
Sprache:eng
Schlagworte:
Astronomy
Gamma ray astronomy
Statistical methods
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Zusammenfassung:The durations ( T 90 ) of 315 GRBs detected with Fermi /GBM (8-1000 keV) by 2011 September are calculated using the Bayesian Block method. We compare the T 90 distributions between this sample and that observed with previous/current GRB missions. We show that T 90 is energy-band dependent and the observed bimodal T 90 distribution would be due to the instrumental selection effect.
ISSN:1743-9213
1743-9221
DOI:10.1017/S1743921312019230