Electronic Telegram No. 456 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 2006bg R. Holmes and V. Hoette, Charleston, IL, report the discovery of an apparent supernova (mag 18.4) on an unfiltered CCD frame taken with the Astronomical Research Observatory 0.40-m reflector on 2006 Mar. 27.28 UT. The new object was confirmed at mag 18.3 on an unfiltered CCD frame (limiting mag 20.2) taken by Holmes on Apr. 2.18. SN 2006bg is located at R.A. = 11h35m25.17s, Decl. = +54o57'37".4 (equinox 2000.0), which is 16".5 west and 2".3 north of the center of the nearest galaxy, which itself is in the cluster Abell 1318. Nothing is visible at this location on an unfiltered frame taken by Holmes on Jan. 26.38 (limiting mag 20.4) or in Palomar Sky Survey images taken on 1993 Apr. 25 (limiting red mag about 21.0) and 1950 Mar. 20 (limiting red mag about 20.0). NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2006 CBAT 2006 April 3 (CBET 456) Daniel W. E. Green