2008CBET.1273....1Y

F. Yuan, University of Michigan; R. Quimby, California Institute of Technology; D. Chamarro, M. D. Sisson, and C. Akerlof, University of Michigan; and J. C. Wheeler, University of Texas, on behalf of the ROTSE collaboration, report the discovery of a supernova in unfiltered CCD images taken with the 0.45-m ROTSE-IIIb telescope at McDonald Observatory. The supernova is located at R.A. = 12h24m37s.92, Decl. = +10o50'17".4 (equinox 2000.0), which is 5".3 east and 3".1 south of the center of IC 3284; 2008ar was discovered on Feb. 27.25 UT at mag about 16.9 and imaged again on Feb. 28.25 at mag about 16.0.