Electronic Telegram No. 146 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 2005bv V. Lipunov, A. Krylov, V. Kornilov, G. Borisov, D. Kuvshinov, A. Belinski, G. Antipov, E. Gorbovskoy, M. Kuznetsov, S. Potanin, N. Tyurina, and V. Vladimirov, Sternberg Astronomical Institute, reports the discovery of an apparent supernova (red mag 16.5) on unfiltered CCD images (scale 2".1/pixel) taken with the MASTER 0.36-m robotic telescope on Apr. 20.939 UT. Confirming images show the new object still at mag 16.6-16.7 on Apr. 28.9. SN 2005bv is located at R.A. = 14h24m07s.44, Decl. = +26o17'50".3 (equinox 2000.0), which is 11" east and 9" south of the center of the apparent host galaxy. Nothing was visible at this location on a MASTER image taken on 2004 May 7.92 (limiting mag 18.7). NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the formal IAU Circulars. (C) Copyright 2005 CBAT 2005 April 29 (CBET 146) Daniel W. E. Green