2010CBET.2177....2S

J. M. Silverman, M. T. Kandrashoff, and A. V. Filippenko, University of California, Berkeley, report that inspection of a low-signal-to-noise- ratio CCD spectrum (range 360-990 nm), obtained on Feb. 19 UT with the 3-m Shane reflector (+ Kast) at Lick Observatory, shows that 2010ad is a supernova, probably of type II. Cross-correlation with a library of supernova spectra using the "SuperNova IDentification" code of Blondin and Tonry (2007, Ap.J. 666, 1024) indicates that 2010ad is most similar to the spectrum of the type-IIb supernova 1993J about a week past maximum brightness.