2011CBET.2794....1Z

W. Zheng and A. Romadan, University of Michigan; J. Vinko, University of Szeged; R. Quimby, California Institute of Technology; N. Whallon, B. Sandler, F. Yuan, and C. Akerlof, University of Michigan; J. C. Wheeler and E. Chatzopoulos, University of Texas; and G. H. Marion Harvard-Smithsonian Center for Astrophysics, on behalf of the ROTSE collaboration, report the discovery of a new supernova (mag about 16.6) in unfiltered images taken on Aug. 20.22 and 25.19 UT with the 0.45-m ROTSE-IIIb telescope at McDonald Observatory. The new object is located at R.A. = 23:23:20.59, Decl. = +16:47:41.3 (equinox 2000.0; uncertainty about 1"), which is 1".5 west and 1".1 south of the center of the host galaxy (SDSS J232320.68+164742.5). A finding chart for the object can be found at the following website URL: http://www.rotse.net/rsvp/j232320.6+164742/ROTSE3_J232320.6+164742.jpg.