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Duration distributions of bright and dim BATSE gamma-ray burstsWe have measured the T(sub 90) and T(sub 50) durations of bright and dim gamma-ray bursts detected by the Compton Gamma-Ray Observatory's (CGRO) Burst and Transient Source Experiment (BASTE). The T(sub 90) T(sub 50) duration is defined as the interval over which 5% (25%) to 95% (75%) of the burst counts accumulate. Out of 775 bursts observed by BATSE 159 bursts were analyzed; bursts with durations shorter than 1.5 s were excluded. A Kolmogorov-Smirnov test yields a probability of 6 x 10(exp -5) that the T(sub 50) durations of the dim and bright samples are drawn from the same parent population. We find that the centroid and extent of the duration distribution for the dim sample are scaled by approximately a factor of 2 relative to those of the bright sample. The measured time-dilation factor is not sensitive to choice of energy band. These results are quantitatively consistent with previous tests for time dilation in a smaller sample of BATSE bursts. The sources of dimmer bursts, if cosmological, would lie at redshifts of order 2.
Document ID
19950044694
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Norris, J. P.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Bonnell, J. T.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Nemiroff, R. J.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Scargle, J. D.
(NASA Ames Research Center Moffett Field, CA, United States)
Kouveliotou, C.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Paciesas, W. S.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Meegan, C. A.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Fishman, G. J.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Date Acquired
August 16, 2013
Publication Date
February 1, 1995
Publication Information
Publication: The Astrophysical Journal, Part 1
Volume: 439
Issue: 2
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
95A76293
Distribution Limits
Public
Copyright
Other

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