Afterglow of the gamma-ray burst of July 23, 1992, as observed by the SIGMA/Granat telescope

Details Afterglow of the gamma-ray burst of July 23, 1992, as observed by the SIGMA/Granat telescope Afterglow of the gamma-ray burst of July 23, 1992, as observed by the SIGMA/Granat telescope

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999astl...25..411b&link_type=abstract

Astronomy Letters, Volume 25, Issue 7, July 1999, pp.411-416

Astronomy and Astrophysics

Astronomy

6

Scientific paper

We present observations of the afterglow of the bright cosmic gamma-ray burst of July 23, 1992, which was within the field of view of the SIGMA/GRANAT secondary optics. After the burst of ~6-s duration, a decaying soft gamma-ray (35-300 keV) emission was observed for ~1000 s. About 20% of the burst energy radiated away in this time. The light curve of the main event smoothly goes into afterglow, in which the flux falls off as a power law with an index of -0.7. At the onset of the flux decline from the main event, the hardness changes abruptly. The spectral hardness of the afterglow in the 8 to 200-keV energy band corresponds to a power-law spectrum with a spectral index alpha approximately equal to 1.0, while during the burst alpha = 0.0-0.3. The afterglow parameters are discussed in terms of the relativistic fireball model.

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