Electronic Telegram No. 1685 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 SUPERNOVAE 2009Z AND 2009aa Further to CBET 1680, C. Griffith, S. B. Cenko, W. Li, and A. V. Filippenko, University of California, report the LOSS discovery of two apparent supernovae on unfiltered KAIT images: SN 2009 UT R.A. (2000.0) Decl. Mag. Offset 2009Z Feb. 2.53 14 01 53.61 - 1 20 30.2 18.1 2".7 W, 4".1 N 2009aa Feb. 3.40 11 23 42.28 -22 16 14.5 17.6 19".2 E, 0".5 S Additional KAIT magnitudes for 2009Z: a combined image from 2008 June to July, [19.4; 2009 Feb. 4.47, 17.8. Additional KAIT magnitudes for 2009aa in ESO 570-G20: a combined image from 2008 Dec. to 2009 Jan., [18.7; 2009 Feb. 4.39, 17.4. NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2009 CBAT 2009 February 5 (CBET 1685) Daniel W. E. Green