BeppoSAX Detection and Follow-up of GRB980425

Preprint

8 March 1999

preprint
Published by arXiv in arXiv

Abstract

We present BeppoSAX GRBM and WFC light curves of GRB980425 and follow-up data obtained with NFI Target of Opportunity observations 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 SN1998bw, 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 subsequent NFI pointings and exhibits a decline of a factor of two in six months. If it is associated with SN1998bw, this is the first detection of hard X-ray emission from a Type I supernova. The latter source is no longer detected starting ~40 hours after the GRB. Selecting either source as a candidate for the GRB counterpart leads to radically different scenarios for the origin of the gamma-ray event.

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All Related Versions

Version 1, 1999-03-08, ArXiv
Version 2, 1999-07-13, ArXiv
Published version: Astronomy and Astrophysics Supplement Series, 138 (3), 463.

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