arXiv · astro-ph/9902006
GRANAT/SIGMA Observation of the Early Afterglow from GRB 920723 in Soft Gamma-Rays
Abstract
We present a GRANAT/SIGMA observation of the soft gamma-ray afterglow immediately after GRB 920723. The main burst is very bright. After ~6 s, the burst light curve makes a smooth transition into an afterglow where flux decays as t^{-0.7}. The power-law decay lasts for at least 1000 s; beyond this time, the afterglow emission is lost in the background fluctuations. At least ~20% of main burst energy is emitted in the afterglow. At approximately ~6 s after the trigger, we also observe an abrupt change in the burst spectrum. At t<6 s, the ratio of 8-20 and 75-200 keV fluxes corresponds to the power law spectral index α=0.0-0.3. At t=6 s, the value of αincreases to α= ~1 and stays at this level afterwards. The observed afterglow characteristics are discussed in connection with the relativistic fireball model of gamma-ray bursts.
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R. A. Burenin, A. A. Vikhlinin, M. R. Gilfanov, O. V. Terekhov, A. Yu. Tkachenko, S. Yu. Sazonov, E. M. Churazov, R. A. Sunyaev, P. Goldoni, A. Claret, A. Goldwurm, J. Paul, J. P. Roques, E. Jourdain, F. Pelaez, G. Vedrenne. 1999-02-14. GRANAT/SIGMA Observation of the Early Afterglow from GRB 920723 in Soft Gamma-Rays. https://arxiv.org/abs/astro-ph/9902006
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