The Transition from the Main Burst to the Afterglow from Granat/sigma Data

Details The Transition from the Main Burst to the Afterglow from Granat/sigma Data The Transition from the Main Burst to the Afterglow from Granat/sigma Data

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002nmgm.meet.2415b&link_type=abstract

"THE NINTH MARCEL GROSSMANN MEETING On Recent Developments in Theoretical and Experimental General Relativity, Gravitation and R

Physics

Scientific paper

The stable background of the SIGMA telescope aboard GRANAT allows to investigate GRB flux fading on the ~ 103 s time scale. The results of SIGMA observations of GRBs extended emission are presented. SIGMA observed the early afterglow of the brightest detected burst GRB 920723. We observe the power-law decay during 1000 s. In the beginning of this decay an abrupt change in the burst spectrum is also observed. The other bursts detected by SIGMA main detector revealed no convincing afterglows, primarily because of their faintness. However a positive flux in the 100-800 s time interval is detected at more than 95% confidence when averaged over the faint bursts suggesting that a sufficient part of these bursts may have the early afterglows similar to one observed in GRB 920723. These results are discussed in the frames of relativistic fireball model of GRBs.

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