2010CBET.2272....1S

J. M. Silverman, M. T. Kandrashoff, and A. V. Filippenko, University of California, Berkeley, report that inspection of a CCD spectrum (range 340-1000 nm), obtained on May 7 UT with the 3-m Shane reflector (+ Kast) at Lick Observatory, shows that 2010bs (CBET 2247) is a type-II supernova whose H-alpha emission greatly dominates over the absorption component. Cross- correlation with a library of supernova spectra using the "SuperNova IDentification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) indicates that 2010bs is about 3 weeks past maximum light. SN 2010cn (CBET 2269) is likely a type-IIb supernova, in agreement with the findings of Marion et al. (CBET 2270); the object is confirmed to be at a redshift of 0.026. Cross-correlation with a library of supernova spectra using SNID indicates that 2010cn is near maximum light.