BeppoSAX detection and follow-up of GRB 980425
Abstract
We present BeppoSAX GRBM and WFC light curves of GRB 980425 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 GRB 980425, 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.
- Publication:
-
Astronomy and Astrophysics Supplement Series
- Pub Date:
- September 1999
- DOI:
- 10.1051/aas:1999310
- arXiv:
- arXiv:astro-ph/9903113
- Bibcode:
- 1999A&AS..138..463P
- Keywords:
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- GAMMA-RAYS: BURSTS;
- Astrophysics
- E-Print:
- 2 pages, 1 PostScript figure, submitted to A&