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For refcode 1991IAUC.5239....1W:
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1991IAUC.5239....1W Circular No. 5239 Central Bureau for Astronomical Telegrams SUPERNOVA 1991T IN NGC 4527 E. Waagen, AAVSO, reports the discovery of a supernova by Stephen Knight, Waterford, ME, in NGC 4527 (R.A. = 12h31m.6, Decl. = +2 56', equinox 1950.0). The object has been independently reported by Robert O. Evans, Hazelbrook, N.S.W.; by M. Villi and G. Cortini, Monte Colombo, Italy; and by Wayne Johnson, Anza, CA. Visual magni- tude estimates: Apr. 4.48 UT, [15 (Evans); 9.9, [15 (Villi and Cortini); 13.17, 14 (Knight); 14.14, 13.6 (Knight); 15.6, 13 (Evans); 15.9, 13.0 (Villi and Cortini); 16.26, 13.5 (Johnson). The fol- lowing position was measured by R. H. McNaught, Anglo-Australian Observatory, from an Uppsala Southern Schmidt photo taken Apr. 15.5: R.A. = 12h31m36s.91, Decl. = +2 56'28".3; offsets from the nucleus are 25".7 east, 44".4 north. A nearby star of mag about 16 is located at R.A. = 12h31m42s.80, Decl. = +2 55'15".1. J. Mueller, Palomar Observatory, reports that an IVN (near-infrared) plate taken Apr. 10 with the Oschin Schmidt Telescope failed to show the supernova. E. Cappellaro, Padua Observatory, reports: "G. Cutispoto (Ca- tania Observatory) obtained the following photometry under non- photometric conditions with the European Southern Observatory 1-m telescope on Apr. 16.35 UT, V = 12.9, B-V = +0.1, U-B = -0.6, V-R = +0.1. A CCD spectrogram (range 350-830 nm) obtained by F. La Franca (Padua University) and C. Goldschmidt (Edinburgh University; correc- tion to IAUC 5237, line 5 from bottom) at the ESO 2.2-m telescope shows a blue, almost featureless continuum, with only two strong lines having P-Cyg profile and absorption measured at 424 and 494 nm. The bright magnitude, the blue color, and the lack of the Balmer lines seem to indicate a type-I SN before maximum." R. P. Kirshner, Harvard-Smithsonian Center for Astrophysics, notes that the feature from 424 to 494 nm is also present on a spectrum obtained on Apr. 16.18 UT by J. Peters with the 1.5-m reflector at the Whipple Obser- vatory. The spectrum is highly unusual but is certainly not that of a classic type-II or type-Ia supernova near maximum; it could well be that of a type-I supernova in its very early stages. 1991 April 16 Daniel W. E. Green
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