Electronic Telegram No. 2363 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 2010ga Jan Vales, Crni Vrh Observatory, reports the discovery of an apparent supernova (mag 17.3) in four unfiltered CCD images taken on July 8.92-8.96 UT with the 60-cm f/3.3 Cichocki reflector in the course of the Comet and Asteroid Search Program (PIKA) at the Crni Vrh Observatory. The new object is located at R.A. = 0h34m43s.83, Decl. = +9o54'36".1 (equinox 2000.0), which is 17" east and 2" south of the nucleus of the galaxy designated 2MASX J00344266+0954382. Nothing is visible at this position on archival PIKA images obtained on 2008 Oct. 20.04 (limiting magnitude 18.0) or on a Palomar Sky Survey F plate from 1990 Oct. 14 (via the Digitized Sky Survey/Aladin). Jure Skvarc, Crni Vrh Observatory, reports that a confirmation image of 2010ga was obtained by S. Maticic at Crni Vrh Observatory on July 10.03 using a photometric R filter, from which Skvarc measured R = 18.19 +/- 0.03. Following posting on the Central Bureau's unconfirmed-objects webpage, Vitali Nevski (Vitebsk, Belarus) reports that he obtained unfiltered CCD images of 2010ga on July 9.958 with a 0.3-m reflector, yielding mag 17.7 and position end figures 43s.82, 36".4 (USNO-B1.0 catalogue), adding that nothing is visible at this position on a Palomar Sky Survey DSS image obtained on 1990 Oct. 14 (via the Digitized Sky Survey; limiting red mag 21). NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2010 CBAT 2010 July 10 (CBET 2363) Daniel W. E. Green