Electronic Telegram No. 2365 Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION CBAT Director: Daniel W. E. Green; Room 209; Dept. of Earth and Planetary Sciences; Harvard University; 20 Oxford St.; Cambridge, MA 02138; U.S.A. e-mail: cbat@iau.org; cbatiau@eps.harvard.edu URL http://www.cfa.harvard.edu/iau/cbat.html SUPERNOVA 2010gb IN UGC 9947 T. Boles, Coddenham, England, reports the discovery of an apparent supernova (mag 16.5) on unfiltered CCD images taken on June 11.005 and 11.925 UT with a 0.35-m reflector. The new object is located at R.A. = 15h38m39s.79, Decl. = +41o00'19".9 (equinox 2000.0), which is approximately 8".0 west and 1".8 north of the center of UGC 9947. Nothing is present at this position on Boles' images from 2010 Feb. 19 and Apr. 21 (limiting mag 19.5) or on Digitized Sky Survey plates from 1993 Apr. 17 (limiting red mag 20.5) and 1990 Mar. 31 (limiting blue mag 21.0). After posting on the Central Bureau's unconfirmed-objects webpage, F. Ciabattari, S. Donati, E. Mazzoni, and M. Rossi, Borgo a Mozzano, Italy, report their independent discovery of 2010gb on unfiltered CCD images obtained on July 10.89 (limiting mag 18.5) and July 11.87-11.90 UT (limiting mag 18.7) with a 0.5-m Newtonian reflector, noting mag 15.8 on July 10.89 and mag 16.2 on July 11; they measured position end figures 39s.80, 20".1, and add that nothing is visible at this position on DSS plates from the Palomar Sky Survey on 1993 Apr. 17 (F plate, limiting mag 20.3) and 1990 Mar. 31 (J plate, limiting mag 20.3). NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2010 CBAT 2010 July 12 (CBET 2365) Daniel W. E. Green