XMM-Newton Observations of the Field of Gamma-Ray Burst 980425

Details XMM-Newton Observations of the Field of Gamma-Ray Burst 980425 XMM-Newton Observations of the Field of Gamma-Ray Burst 980425

2003-04-29

arxiv.org/abs/astro-ph/0304521v1

Astronomy and Astrophysics

Astrophysics

5 pages, 2 figures; in press in Adv. Sp. Res., Proceedings of the 34th COSPAR Scientific Assembly, Houston, 10-19 October 2002

Scientific paper

10.1016/j.asr.2003.04.072

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.

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