2010CBET.2143....1D

A. Dimai and F. Martinelli, on behalf of the CROSS program (cf. IAUC 7373), report their discovery of an apparent supernova (mag about 15.8) on two unfiltered CCD images (limiting magnitude about 19.5) taken on Jan. 23.87 UT with a Celestron 35.6-cm f/11 telescope at the Martinelli Observatory near Pisa, Italy. The new object, which was confirmed at mag about 15.5 on images (limiting mag about 18.5) taken on Jan. 24.75, is located at R.A. = 4:07:47.27, Decl. = +69:48:47.0 (equinox 2000.0), which is 2".6 east and 1".3 north of the nucleus of the galaxy IC 356. A CROSS image of the same field taken on 2009 Nov. 24 showed nothing at this position (limiting mag about 19.0), and it does not appear on Palomar Sky Survey infrared, red, and blue plates. The discovery image has been posted at website URL http://www.cortinastelle.it/IC0356_20100123.jpg.