Sky Coverage and Burst Repetition

Astronomy and Astrophysics – Astrophysics

Scientific paper

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12 pages AASTeX 4.0, 3 figures on request from dband@ucsd.edu

Scientific paper

10.1086/177350

To investigate the repeater content of gamma ray burst samples I develop two models where sources burst at a constant average rate. I find that the sky coverage affects the number of repeaters in a sample predominantly through the detector livetime, and that the number of bursts in the sample is the primary parameter. Thus the repeater content of burst samples should be compared within the context of a repetition model; a direct comparison between two samples is possible only if the samples have similar sizes. The observed repeater fraction may not be the actual fraction if the sources burst on average less than once during the detector livetime. Sources which burst repeatedly during active phases separated by more than the observation period must be treated separately.

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