2010CBET.2268....1B

G. Bock, Windaroo, Queensland, Australia, reports the discovery by Stuart Parker, Oxford, Canterbury, New Zealand, of an apparent supernova (red mag 16.3) on a 35-s unfiltered image taken on May 3.756 UT using a 35-cm Celestron C14 f/6.3 reflector (+ ST10 CCD camera). An image (limiting red mag 17.8) taken by Parker on May 4.725 shows the new object at mag 16.1. SN 2010cm is located at R.A. = 1:30:03.91, Decl. = -42:41:10.6 (equinox 2000.0), which is 15" west and 1" south of the nucleus of the galaxy PGC 5597 (= ESO 244-G31); the astrometry and photometry measurements were by Bock. Nothing is visible at this position on Digitized Sky Survey red and infrared images (limiting red magnitude 19 or fainter), on an image taken by Parker on 2010 Apr. 2, or on an image taken by P. Marples (Loganholme, Queensland) on 2009 Oct. 16 (limiting red mag 17.5). The type-II supernovae 2005Q (IAUC 8473) and 2005me (IAUC 8647) also appeared in this galaxy.