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Circular No. 6087 Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION Postal Address: Central Bureau for Astronomical Telegrams Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A. IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions) Phone 617-495-7244/7440/7444 TWX 710-320-6842 ASTROGRAM CAM MARSDEN@CFA.HARVARD.EDU or GREEN@CFA.HARVARD.EDU (science) SUPERNOVA 1994Z IN NGC 87 A. Wassilieff, Palmerston North, New Zealand, reports his CCD discovery of a supernova on Oct. 2.51 UT, about 36" east and 12" south of the nucleus of NGC 87. The object was estimated at mag 14.6 and noted again on Oct. 3.38, and it was not present on a similar image obtained on 1992 Nov. 29. Measurements by G. V. Williams of the faxed image (scale 7".5/mm) yield the position R.A. = 0h18m49s.49, Decl. = -48d54'28".0 (equinox 1950.0). End figures for the galaxy nucleus are 47s.16, 20".3. M. M. Phillips, Cerro Tololo Interamerican Observatory, reports that CCD images obtained by J. Maza and X. Gomez on Oct. 4 confirm the presence of an apparent supernova in NGC 87. Conditions were not photometric, but a comparison with a sequence around T Phe gave V about 16, B-V about +0.1. S. Benetti, European Southern Observatory (ESO) and G. Hasinger, Astrophysikalisches Institut, Potsdam, report that inspection of a fully-reduced CCD spectrum (range 450-700 nm, resolution 1.1 nm) obtained on Oct. 4.12 UT with ESO 2.2-m telescope + EFOSC2 confirms that the object is a type II supernova 2-3 weeks after outburst. Strong H beta and H alpha lines with P-Cyg profiles are superimposed on a blue continuum. The He I 587.6-nm line is also present with a P-Cyg profile. The expansion velocity deduced from the minima of the H beta and He I 587.6-nm lines is about 10 000 km/s. A velocity of 12 000 km/s is deduced from the H alpha minimum. X-RAY NOVA IN SCORPIUS N. Alexandrovich, K. Borozdin, V. Efremov and R. Sunyaev, Space Research Institute, Moscow, on behalf of the MIR-KVANT team, report: "According to data from the TTM telescope onboard the MIR space station this x-ray nova is in a high (soft) spectral state typical of black-hole candidates and similar to that observed recently in the superluminous radio source GRS 1915-105 (IAUC 6080). The flux detected at 5 keV was 500 mCrab on Sept. 24 and 600 mCrab on Sept. 25. The source spectrum within the 2-15-keV band can be approximated by a blackbody fit with kT = 1.06 +/- 0.02 keV. According to MIR-KVANT-HEXE data, the 3-sigma upper limit to the tail of the hard flux is 5 and 15 mCrab in the 15-45-keV and the 45-105-keV data, respectively. In hard x-rays the source is much weaker than 4U 1700-37 (50 mCrab in 15-45-keV band), which is separated from the Sco x-ray nova by less than three degrees." 1994 October 4 (6087) Brian G. Marsden
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