BeppoSAX detection and follow-up of GRB 980425
Pian, E. ; Amati, L. ; Antonelli, L. A. ; ...Giommi, P. ; ...Coletta, A. ; et al.
Sep - 1999
ISSN : 0365-0138 ;
journal : Astronomy and Astrophysics Supplement Series

Issue : 3
type: Article Journal

Abstract
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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