BeppoSAX Detection and Follow-up of GRB980425
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.
Keywords
Cite
@article{arxiv.astro-ph/9903113,
title = {BeppoSAX Detection and Follow-up of GRB980425},
author = {E. Pian and L. Amati and L. A. Antonelli and R. C. Butler and E. Costa and G. Cusumano and J. Danziger and M. Feroci and F. Fiore and F. Frontera and P. Giommi and N. Masetti and J. M. Muller and T. Oosterbroek and A. Owens and E. Palazzi and L. Piro and A. Castro-Tirado and A. Coletta and D. Dal Fiume and S. Del Sordo and J. Heise and L. Nicastro and M. Orlandini and A. Parmar and P. Soffitta and V. Torroni and J. J. M. in 't Zand},
journal= {arXiv preprint arXiv:astro-ph/9903113},
year = {2009}
}
Comments
2 pages, 1 PostScript figure, submitted to A&AS, Proc. of the Conference "Gamma-Ray Bursts in the Afterglow Era", held in Rome, 1998 November 3-6. Results concerning 'Source 2' have been updated