BeppoSAX Detection and Follow-up of GRB980425

E. Pian; L. Amati; L. A. Antonelli; R. C. Butler; E. Costa; G. Cusumano; J. Danziger; M. Feroci; F. Fiore; F. Frontera; P. Giommi; N. Masetti; J. M. Muller; T. Oosterbroek; A. Owens; E. Palazzi; L. Piro; A. Castro-Tirado; A. Coletta; D. Dal Fiume; S. Del Sordo; J. Heise; L. Nicastro; M. Orlandini; A. Parmar; P. Soffitta; V. Torroni; J. J. M. in 't Zand

doi:10.1051/aas:1999310

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arXiv · astro-ph/9903113

BeppoSAX Detection and Follow-up of GRB980425

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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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E. Pian, L. Amati, L. A. Antonelli, R. C. Butler, E. Costa, G. Cusumano, J. Danziger, M. Feroci, F. Fiore, F. Frontera, P. Giommi, N. Masetti, J. M. Muller, T. Oosterbroek, A. Owens, E. Palazzi, L. Piro, A. Castro-Tirado, A. Coletta, D. Dal Fiume, S. Del Sordo, J. Heise, L. Nicastro, M. Orlandini, A. Parmar, P. Soffitta, V. Torroni, J. J. M. in 't Zand. 1999-07-13. BeppoSAX Detection and Follow-up of GRB980425. https://doi.org/10.1051/aas%3A1999310

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