Electronic Telegram No. 77 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 2004dx IN MCG +07-37-36 T. Boles, Coddenham, Suffolk, England, reports the discovery of an apparent supernova of mag 18.1 on unfiltered CCD images taken on Aug. 19.953 and 21.950 UT with a 0.35-m reflector. The new object is located at R.A. = 18h18m06s.15, Decl. = +39o49'24".9, which is approximately 2".4 east and 6".3 south of the center of MCG +07-37-36. The suspect is not present on Boles' images from June 27 and May 18 (limiting mag 19.5), and it is not present on DSS II red (1992.484) or blue (1989.505) plates. 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 August 22 (CBET 77) Brian G. Marsden