On the usefulness of ‘‘variability in gamma‐ray bursts
- Conference date: 20−22 Oct 1993
- Location: Huntsville, Alabama (USA)
We investigate the usefulness of V=C64 max/C1024 max which has been introduced by Lamb, Graziani, and Smith (hereafter L93) as a criterion to separate gamma‐ray bursts into two classes, called ‘‘variable’’ and ‘‘smooth’’. Bursts with durations ≤0.4 sec must have values of V which make them ‘‘variable’’ according to the criterion used by L93. Therefore, the majority (∼22 of 34) of the bursts designated as ‘‘variable’’ do not deserve to be so called any more than their smooth bursts do; their selection according to V is based on their durations. It is therefore no surprise that there exists a correlation between burst duration and ‘‘variability’’; neither is it a surprise that there exists a correlation between burst hardness and ‘‘variability’’, since this reflects the known correlation between spectral hardness and burst duration.
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