A Classical Gamma-Ray Burst Repeater?

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Session 74 -- Gamma-Ray Bursts
Oral presentation, Thursday, 2:30-4:00, Zellerbach Auditorium Room

[74.01] A Classical Gamma-Ray Burst Repeater?

R.E.Lingenfelter, V.Wang (UCSD)

We find that the sample of gamma-ray bursts, observed by the BATSE experiment on the Compton Gamma Ray Observatory, has a conspicuous set of 5 bursts which are closely associated in both space and time, separated in position by less than their positional uncertainty and separated in time by less than a few days. From a preliminary statistical analysis of these associations, we estimate that the probability of such a set of 5 bursts being random is less than 10$^{-4}$, while the probability that they come from a single repeating source is 85\%. Thus, we suggest that these bursts arise from a repeating source at a location of $\sim$ 0855$-$00. Unlike most of the ``soft" gamma-ray repeaters, these repeating bursts have relatively hard spectra and widely varying durations, that are indistinguishable from the common, ``classical" gamma-ray bursts.

Thursday program listing