Electronic Telegram No. 1690 Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A. IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions) CBAT@CFA.HARVARD.EDU (science) URL http://www.cfa.harvard.edu/iau/cbat.html SUPERNOVA 2009ab IN UGC 2998 Further to CBET 1685, J. Rex, W. Li, S. B. Cenko, and A. V. Filippenko, University of California, report the LOSS discovery of an apparent supernova on unfiltered KAIT images: SN 2009 UT R.A. (2000.0) Decl. Mag. Offset 2009ab Feb. 8.24 4 16 36.39 + 2 45 51.0 18.6 31".2 E, 18".4 N Nothing was visible at this position on a KAIT image taken on Feb. 2.25 UT (limiting magnitude 19.7). M. V. Persson and R. J. Cumming, Stockholm University, report the following preliminary magnitudes for 2009ab, obtained on Feb. 9.75 using the 1-m AlbaNova Telescope at Stockholm: B = 16.2, V = 16.5, R = 17.1. NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2009 CBAT 2009 February 9 (CBET 1690) Daniel W. E. Green