NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-07-20 T23:52:52 PDT
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For refcode 1999IAUC.7143A...1G:
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NED Abstract

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1999IAUC.7143A...1G Circular No. 7143 Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION SUPERNOVA 1999br IN NGC 4900 P. Garnavich, S. Jha, P. Challis, and R. Kirshner, Harvard- Smithsonian Center for Astrophysics, report that a spectrum of SN 1999br was obtained by M. Calkins with the 1.5-m Tillinghast telescope on Apr. 15.3 UT. Broad Balmer emission lines on a very blue continuum are seen, indicating that this is a type-II event discovered at an early stage. H-alpha shows only a weak absorption trough, but the later Balmer series have clear P-Cyg profiles. He I 587.5-nm has an emission flux comparable to that of H-beta. Narrow host-galaxy emission lines give a recession velocity of 965 km/s. A. V. Filippenko, University of California at Berkeley, reports that inspection of a CCD spectrum (range 560-860 nm) of SN 1999br, obtained on Apr. 15 by D. Stern (Berkeley) and M. Reuland (Leiden) with the 3-m Shane reflector at Lick Observatory, reveals that the object is indeed a supernova, possibly of type II. However, the spectrum is peculiar, with emission lines at observed wavelengths near 580, 720, and 790 nm whose strength is comparable to that of the line near 660 nm (presumably H-alpha). If the supernova is indeed associated with NGC 4900, it is very subluminous, regardless of its type. W. Li, University of California at Berkeley, reports that he has searched the KAIT database for observations of NGC 4900 (cf. IAUC 7141), and found no hint of SN 1999br on a poor frame (limiting mag 17) taken on Apr. 4.4 UT. Also, a frame taken on Mar. 27.4 shows no image of the supernova to limiting mag about 18.5. (C) Copyright 1999 CBAT 1999 April 15 (7143) Daniel W. E. Green
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