XMM-Newton observations of the field of γ-ray burst 980425

Authors :: Pian, E.
Giommi, P.
Amati, L.
Costa, E.
Danziger, J.
Feroci, M.
Fiocchi, M.T.
Frontera, F.
Kouveliotou, C.
Masetti, N.
Nicastro, L.
Palazzi, E.
Piro, L.
Tavani, M.
in ’t Zand, J.J.M.
Source :: Advances in Space Research. Dec2004, Vol. 34 Issue 12, p2711-2714. 4p.
Publication Year :: 2004
Abstract: Abstract: The error box of GRB980425 has been observed by XMM-Newton in March 2002, with the aim of measuring the late epoch X-ray emission of the supernova 1998bw and of clarifying its supposed association with the GRB itself. We present here the preliminary results obtained with the EPIC PN camera. Our observations confirm the association between SN 1998bw and GRB980425. The EPIC PN measurement of the SN 1998bw flux is significantly below the extrapolation of the power-law temporal trend fitted to the BeppoSAX points and implies a faster temporal decay. We propose different physical interpretations of the SN X-ray light curve, according to whether it is produced by one or more radiation components. [Copyright &y& Elsevier]