GRANAT/SIGMA observation of GRB 920723 soft gamma-ray afterglow

Details GRANAT/SIGMA observation of GRB 920723 soft gamma-ray afterglow GRANAT/SIGMA observation of GRB 920723 soft gamma-ray afterglow

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26as..138..443b&link_type=abstract

Astronomy and Astrophysics Supplement, v.138, p.443-444

Astronomy and Astrophysics

Astrophysics

9

Gamma-Rays: Bursts

Scientific paper

We present GRANAT/SIGMA observations of the soft gamma-ray afterglow immediately after the bright GRB 920723. After ~ 6 s, the burst light curve makes a smooth transition into an afterglow where flux decays as t(-0.7) for at least { ~ }1000 s. At least { ~ }20% of main burst energy is emitted in the afterglow. The hardness of the afterglow spectrum corresponds to the power law spectral index ~ 1, which is significantly softer than the main burst.

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