Issue |
A&A
Volume 401, Number 1, April I 2003
|
|
---|---|---|
Page(s) | 129 - 140 | |
Section | Extragalactic astronomy | |
DOI | https://doi.org/10.1051/0004-6361:20021863 | |
Published online | 17 March 2003 |
On the difference between the short and long gamma-ray bursts
1
Konkoly Observatory, Budapest, Box 67, 1525, Hungary
2
Laboratory for Information Technology, Eötvös University, Budapest, Pázmány Péter sétány 1/A, 1117, Hungary e-mail: bagoly@ludens.elte.hu
3
Dept. of Physics, Bolyai Military University, Budapest, Box 12, 1456, Hungary e-mail: hoi@bjkmf.hu
4
Astronomical Institute of the Charles University, 180 00 Prague 8, V Holešovičkách 2, Czech Republic e-mail: meszaros@mbox.cesnet.cz
5
Dept. of Astronomy & Astrophysics, Pennsylvania State University, 525 Davey Lab e-mail: nnp@astro.psu.edu
Corresponding author: L. G. Balázs, balazs@konkoly.hu
Received:
29
August
2002
Accepted:
16
December
2002
We argue that the distributions of both the intrinsic fluence and the intrinsic duration of the γ-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.
Key words: gamma-rays: bursts / methods: statistical / methods: data analysis
© ESO, 2003
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