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- Title
Constraints on γ-ray bursters from soft X-ray transients.
- Authors
Helfand, David J.; Vrtilek, Saeqa Dil
- Abstract
Perhaps the most enigmatic and elusive of the short time scale astrophysical phenomena observed so far are the γ-ray bursts discovered in the Vela satellite data in 19731. After a decade of observational and theoretical work, there is still no agreement on a model for the radiation detected or for the type of astronomical system responsible. We have conducted a search of the Columbia Astrophysics Laboratory's Einstein imaging proportional counter (IPC) database for possible X-ray counterparts to these transient events. The limiting sensitivity was ∼10−10 erg cm−2 with a total exposure of ∼3×106s divided amongst ∼103 1°×1° fields. Four events with a pointlike spatial distribution were detected but their extremely soft spectra (kT ≤ 0.1 keV) makes them unlikely candidates for γ-ray burst counterparts. We use our results here to place limits on the X-ray and γ-ray luminosity ratio and log (number) N-log (flux) S relation for γ-ray bursts, and comment on the constraints placed on models for their origin.
- Publication
Nature, 1983, Vol 304, Issue 5921, p41
- ISSN
0028-0836
- Publication type
Article
- DOI
10.1038/304041a0