On the difference between the short and long gamma-ray bursts

Balázs, Lajos György and Bagoly, Zsolt and Horváth, István and Mészáros, A. and Mészáros, Péter (2003) On the difference between the short and long gamma-ray bursts. Astronomy and Astrophysics, 401 (1). pp. 129-140. ISSN 0004-6361


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We argue that the distributions of both the intrinsic fluence and the intrinsic duration of the gamma-ray emission in gamma-ray bursts from the BATSE sample are well represented by log-normal distributions, in which the intrinsic dispersion is much larger than the cosmological time dilatation and redshift effects. We perform separate bivariate log-normal distribution fits to the BATSE short and long burst samples. The bivariate log-normal behaviour results in an ellipsoidal distribution, whose major axis determines an overall statistical relation between the fluence and the duration. We show that this fit provides evidence for a power-law dependence between the fluence and the duration, with a statistically significant different index for the long and short groups. We discuss possible biases, which might affect this result, and argue that the effect is probably real. This may provide a potentially useful constraint for models of long and short bursts.

Item Type: Article
Subjects: Q Science / természettudomány > QB Astronomy, Astrophysics / csillagászat, asztrofizika
Depositing User: Erika Bilicsi
Date Deposited: 29 Dec 2012 11:41
Last Modified: 29 Dec 2012 11:41

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