Electronic Telegram No. 61 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://cfa-www.harvard.edu/iau/cbat.html SUPERNOVA 2004ab IN NGC 5054 L. A. G. Monard, Pretoria, South Africa, reports his discovery of an apparent supernova (mag 14.7) on three unfiltered CCD images taken on Feb. 21.979 UT. The new object is located at R.A. = 13h16m58s.18, Decl. = -16o37'52".7 (equinox 2000.0), which is 2" west and 11" north of the center of the galaxy NGC 5054. Nothing was visible at this location on images taken by Monard on 2003 Dec. 29.10 (limiting mag 18.5) and 2004 Feb. 1.15 (limiting mag 18.0) or on Digitized Sky Survey images. A confirming unfiltered CCD image taken by T. Vanmunster (Landen, Belgium) with a 0.35-m reflector on Feb. 24.13 shows SN 2004ab at mag 14.5. NOTE: These 'Central Bureau Electronic Telegrams' are intended to be preliminary announcements of items that later appear in the formal IAU Circulars. Citations should normally be made to IAUCs rather than to CBETs. (C) Copyright 2004 CBAT 2004 February 24 (CBET 61) Daniel W. E. Green