Review of observational properties of soft gamma-ray repeaters

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Gamma-Ray Sources, Gamma-Ray Bursts, Gamma-Ray

Scientific paper

The oft expressed characteristics of soft gamma ray repeaters (SGRs) have been determined from observations of the three acknowledged sources: 0526-66, 1806-20, and 1900+14. These general properties are short durations (<1 second), simple profiles, rapid risetimes (<100 ms), soft spectra (kT~35 keV), lack of spectral evolution, and repetition. But, as we shall see, there are individual bursts that violate each of these properties. Quite recently, counterparts at other wavelengths have been proposed and the resulting association with supernova remnants and, therefore, neutron stars, has strengthened the hypothesis of a galactic origin for SGRs. This review will concentrate on the three SGRs and what we have come to know about them, and in the process, have determined to be the observational qualities of SGRs.

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