BeppoSAX Detection and Follow-up of GRB980425

Details BeppoSAX Detection and Follow-up of GRB980425 BeppoSAX Detection and Follow-up of GRB980425

1999-03-08

arxiv.org/abs/astro-ph/9903113v2

Astronomy and Astrophysics

Astrophysics

2 pages, 1 PostScript figure, submitted to A&AS, Proc. of the Conference "Gamma-Ray Bursts in the Afterglow Era", held in Rome

Scientific paper

10.1051/aas:1999310

We present BeppoSAX GRBM and WFC light curves of GRB980425 and NFI follow-up data taken in 1998 April, May, and November. The first NFI observation has detected within the 8' radius error box of the GRB an X-ray source positionally consistent with the supernova SN 1998bw, exploded within a day of GRB980425, and a fainter X-ray source, not consistent with the position of the supernova. The former source is detected in the following NFI pointings and exhibits a decline of a factor of two in six months. If it is associated with SN 1998bw, this is the first detection of hard X-ray emission from a Type I supernova. The latter source exhibits only marginally significant variability. Based on these data, it is not possible to select either source as a firm candidate for the GRB counterpart.

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