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

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

2003-01-14

arxiv.org/abs/astro-ph/0301262v1

Astron.Astrophys.401:129-140,2003

Astronomy and Astrophysics

Astrophysics

A.A. in press ; significantly revised version of astro-ph/0007438; 16 pages 5 PS figures

Scientific paper

10.1051/0004-6361:20021863

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.

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