2010CBET.2126....1Z

W. Zheng, University of Michigan; E. Chatzopoulos, University of Texas; J. Vinko, University of Szeged; R. Quimby, California Institute of Technology; F. Yuan, D. Chamarro, M. D. Sisson, N. Whallon, C. Akerlof, and S. B. Pandey, University of Michigan; J. C. Wheeler, University of Texas; and G. H. Marion, Texas A&M University and University of Texas, on behalf of the ROTSE collaboration, report the discovery of a new supernova (mag about 19.4) in unfiltered images taken on Jan. 9.46 UT with the 0.45-m ROTSE-IIIb telescope at McDonald Observatory. The new object, which was observed again on Jan. 10.46 at mag 19.1 and on Jan. 13.39 at mag 19.5, is located at R.A. = 12:25:10.01, Decl. = +45:19:43.9 (equinox 2000.0; uncertainty about 1"), which is 0".5 west and 1".5 south of the center of the host galaxy, SDSS J122510.05+451945.3; a finding chart for the object can be found at website URL http://www.rotse.net/rsvp/j122510.0+451944/j122510.0+451944.jpg.