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XMM-Newton observations of the field of γ-ray burst 980425 |
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| Authors: | E Pian P Giommi L Amati E Costa J Danziger M Feroci MT Fiocchi F Frontera C Kouveliotou N Masetti L Nicastro E Palazzi L Piro M Tavani JJM in &#x;t Zand |
| Institution: | aINAF, Osservatorio Astronomico di Trieste, Via G.B. Tiepolo 11, 1-34131 Trieste, Italy bASI Science Data Center, c/o ESRIN, Via G. Galilei, 1-00044 Frascati, Italy cIASF-CNR, Sezione di Bologna, Via P. Gobetti 101, 1-40129 Bologna, Italy dIASF-CNR, Sezione di Roma, via Fosso Del Cavaliere 100, 1-00133 Rome, Italy ePhysics Department, University of Ferrara, Via Paradiso 11, 1-44100 Ferrara, Italy fNASA MSFC, SD-50, Huntsville, AL 35812, USA gIASF-CNR, Sezione di Palermo, via U. La Malfa 153, 1-90146 Palermo, Italy hSpace Research Organization Netherlands, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands |
| 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. |
| Keywords: | γ-Ray burst 980425 XMM-NEWTON observations Astrophysics |
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