Other
Scientific paper
Dec 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985natur.318..448l&link_type=abstract
Nature, Volume 318, Issue 6045, pp. 448-449 (1985).
Other
22
Scientific paper
In the 12 yr since the discovery of γ-ray bursts by Klebesadel et al.1, several hundred of these enigmatic events have been observed and catalogued (see, for example, refs 2-5). Their time histories have exhibited a tremendous diversity: they can have durations of milliseconds or minutes; they may contain one or a dozen individual peaks; and they can be highly impulsive or slowly varying. Possibly the only truly unifying observational property of γ-ray bursts is that, with very few exceptions6,7, the bulk of the energy output seems to be in the form of γ-rays. Here we report the detection on 15 December 1984 at 08.25 UT of an extraordinary outburst, qualitatively different in appearance from all previously observed γ-ray bursts. It is described most conveniently as a `classical' multi-peaked, hard-spectrum burst that has been compressed in time by a factor of 10-100 while simultaneously having its intensity increased by a like factor (thus conserving fluence). Its peak intensity was much higher than any other known γ-ray burst except for GB790305b, which had an unusually soft spectrum and other unique features that set it apart from `classical' γ-ray bursts8. However, a key point is that if the intensity of GB841215 had been `normal', its narrow individual spikes would not have been statistically significant with current instrumentation, and the event would have had the appearance of a rather ordinary, short γ-ray burst.
Fenimore Edward E.
Fikani M. M.
Gottwald Manfred
Klebesadel Ray W.
Laros John G.
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