2010CBET.2599....1N

S. Nakano, Sumoto, Japan, reports the discovery by Koichi Itagaki (Teppo-cho, Yamagata) of an apparent supernova (mag 17.5) on unfiltered CCD frames (limiting magnitude 18.5) taken on Dec. 19.383 (0.50-m f/6 reflector) and 20.360 UT (0.60-m f/5.7 reflector). The new object is located at R.A. = 23:23:46.37, Decl. = -29:23:10.0 (equinox 2000.0), which is 11".1 west and 3".3 north of the center of NGC 7645. Nothing is visible at this position on his many past frames, including one taken on 2009 Oct. 19.51 (limiting mag 19.0) and another on 2010 Dec. 8.41 (limiting mag 18.0) or on the Digitized Sky Survey. Itagaki has posted his images at the following website URL: http://www.k-itagaki.jp/images/psn-7645.jpg.