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Date: Mon, 5 Apr 93 12:38:34 +0900 From: nomoto Subject: Rosat detection >From lewin@space.mit.edu Mon Apr 5 05:56:51 1993 Discovery of X-rays from SN 1993J with ROSAT H.U. Zimmermann, MPI f"ur Extraterrestrische Physik (MPE); W. Lewin, E. Magnier, Massachusetts Institute of Technology; P. Predehl, G. Hasinger, W. Pietsch, B. Aschenbach, J. Tr"umper, MPE; G. Fabbiano, Center for Astrophysics; J. van Paradijs, University of Amsterdam; L. Lubin, Princeton University; R. Petre, Goddard Space Flight Center, have observed on UT April 3.4 the SN 1993J in M81 with the ROSAT Observatory. In a 2826 sec exposure using the PSPC detector, the supernova shows up as a bright new source within 10 arcsec of the optical position as given in IAU circular 5731. At this time only raw telemetry data are available, therefore a calibrated X-ray position has to await the final attitude solution. The X-ray SN is located about 1 arcminute northwest of a bright X-ray source that was already detected by EINSTEIN and ROSAT (source X-6 in the paper by Fabbiano 1988, Ap.J. 325, 544). A first estimate of the intensity shows that the SN is about 1.7 times stronger in soft X-rays than X-6.
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