Computer Science
Scientific paper
Sep 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aipc..526..190q&link_type=abstract
GAMMA-RAY BURSTS: 5th Huntsville Symposium. AIP Conference Proceedings, Volume 526, pp. 190-194 (2000).
Computer Science
Gamma-Ray Sources, Gamma-Ray Bursts, Cosmic Rays, Jets And Bursts, Galactic Winds And Fountains
Scientific paper
The 200 brightest GRBs with T90>2 sec were selected from the BATSE 4B catalog and analyzed using wavelets. The rise times, fall times, FWHM, peak heights and peak areas were measured for statistically significant peaks in the sample of 200 GRBs and are consistent with lognormal distributions. The properties of peaks before and after the strongest peak in a GRB were compared for three different categories of bursts, based on the number of peaks in the burst. There is no statistically significant change between the distributions of the rise times, fall times and FWHM of the peaks before and after the strongest peak. Given the spectral evolution observed in GRBs, the lack of temporal evolution is surprising, and should be addressed in any shock scenario within the fireball model. Furthermore, we found that the GRBs with large numbers of peaks to have narrower and faster peaks and larger fluences than the simpler GRBs. This result can be explained by GRBs with more peaks having shocks with a higher average value of Γ. .
Duggan Paul
Hanlon Lorraine
Hurley Kevin J.
McBreen Brian
Quilligan Fergus
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