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Title:
Duration versus brightness of gamma-ray bursts: Comparisons between SIGNE and BATSE
Authors:
Kargatis, V. E.; Li, H.; Liang, E. P.; Smith, I. A.; Hurley, Kevin; Barat, C.; Niel, M.
Affiliation:
AA(Rice University, Houston, TX, US), AB(Rice University, Houston, TX, US), AC(Rice University, Houston, TX, US), AD(Rice University, Houston, TX, US), AE(University of California, Berkeley, CA, US), AF(University of California, Berkeley, CA, US), AG(CESR, Toulouse, France)
Publication:
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 421, no. 2, p. L83-L86 (ApJL Homepage)
Publication Date:
02/1994
Category:
Space Radiation
Origin:
STI
NASA/STI Keywords:
Brightness Distribution, Distribution Functions, Gamma Ray Bursts, Spectral Energy Distribution, Time Measurement, Flux Density, Gamma Ray Observatory, Histograms, Venera Satellites
DOI:
10.1086/187193
Bibliographic Code:
1994ApJ...421L..83K

Abstract

We analyze duration and brightness distributions of both the SIGNE Venera 13 and 14 and Burst and Transient Source Experiment (BATSE) gamma-ray burst databases. Choosing T50 as a measure of the burst duration and using both 64 and 1024 ms peak count rates, we search for correlations between duration, peak brightness, and the ratio V identically equals C64/C1024, proposed as a measure of variability by Lamb, Graziani, & Smith. The duration histogram for SIGNE shows a long-duration peak that is consistent with BATSE, but does not exhibit the short population, instead appearing flat below 0.6 s; the difference is presumably caused by the failure of SIGNE to detect the short, faint bursts that were observed by BATSE. Estimating the instantaneous brightness by C64, we find that SIGNE confirms the BATSE result that the long and short bursts have similar maximum instantaneous brightnesses. Scatter-plots between duration, brightness, and V are consistent for both databases; we show that SIGNE confirms the BATSE observation that there is a lack of bursts that are both bright over 1024 ms and contain a short, bright spike.

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