Evidence for Two Distinct Morphological Classes of
Gamma-Ray Bursts from their Short Time Scale Variability
Lamb, D. Q., Graziani, C., & Smith, I. A.
We have analyzed the 241 bursts for which peak counts Cmax exist in the
publicly available Burst and Transient Source Experiment (BATSE) catalog.
Introducing peak counts in 1024 ms as a measure of burst brightness B and
the ratio of peak counts in 64 and 1024 ms as a measure of short timescale
variability V, we find a statistically significant correlation between the
brightness and the short time scale variability of gamma-ray bursts.
The bursts which are smoother on short time scales are both faint and
bright, while the bursts which are variable on short time scales are faint
only, suggesting the existence of two distinct morphological classes of bursts.
Status:
1993, ApJ, 413, L11.
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