Electronic Telegram No. 1773 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 SUPERNOVA 2009dm IN MCG +07-24-16 J. Newton, Portal, AZ, U.S.A.; and T. Puckett, Ellijay, GA, U.S.A., report the discovery of an apparent supernova (mag 17.5) on unfiltered CCD images (limiting mag 19.1) taken with a 0.40-m reflector at Portal on Apr. 19.24 UT in the course of the Puckett Observatory Supernova Search. The new object, which was confirmed at mag 17.5 on images (limiting mag 19.4) taken by T. Orff on Apr. 20.16 with a 0.40-m reflector at Portal, is located at R.A. = 11h30m20s.14, Decl. = +44o09'49".2 (equinox 2000.0), which is 15".5 west and 3".8 south of the center of MCG +07-24-16. Nothing is visible at this position on images taken by Puckett on Mar. 18 (limiting mag 18.9). NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2009 CBAT 2009 April 20 (CBET 1773) Daniel W. E. Green