Issue |
Astron. Astrophys. Suppl. Ser.
Volume 138, Number 3, September 1999
Gamma-Ray Bursts in the Afterglow Era Contents Rome, November 3-6, 1998
|
|
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Page(s) | 443 - 444 | |
DOI | https://doi.org/10.1051/aas:1999295 | |
Published online | 15 September 1999 |
GRANAT/SIGMA observation of GRB 920723 soft gamma-ray afterglow
1
Space Research Institute, Russian Academy of Sciences, Profsoyuznaya 84/32, 117810 Moscow, Russia
2
Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, 85740 Garching bei Munchen, Germany
3
CEA, Centre d'Études de Saclay, France
4
Centre d'Étude Spatiale des Rayonnements, Toulouse, France
Received:
21
January
1999
Accepted:
16
April
1999
We present GRANAT/SIGMA observations of the soft gamma-ray afterglow
immediately after the bright GRB 920723. After s, the burst light
curve makes a smooth transition into an afterglow where flux decays as
t-0.7 for at least
s. At least
of main burst
energy is emitted in the afterglow. The hardness of the afterglow spectrum
corresponds to the power law spectral index
, which is
significantly softer than the main burst.
Key words: gamma-rays: bursts
© European Southern Observatory (ESO), 1999