Electronic Telegram No. 336 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 2005mg IN UGC 155 J. Newton and T. Puckett report the discovery of an apparent supernova (mag 16.2) on an image taken on Dec. 27.08 UT with a 0.35-m reflector telescope at Portal, AZ, in the course of the Puckett Observatory Supernova Search. The new object was confirmed at mag 15.2 by Puckett on Dec. 27.99 with the 0.60-m reflector. SN 2005mg is located at R.A. = 0h16m44s.21, Decl. = +7o04'19".8 (equinox 2000.0), which is 0".3 east and 14".7 south of the center of UGC 155. Nothing is present at this location on images taken by Puckett on Dec. 1 (limiting mag 19.5). NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2005 CBAT 2005 December 27 (CBET 336) Daniel W. E. Green