2010CBET.2565....1S

J. M. Silverman, S. B. Cenko, M. T. Kandrashoff, and A. V. Filippenko, University of California, Berkeley, report that inspection of a CCD spectrum (range 340-1000 nm), obtained on Nov. 30 UT with the 3-m Shane reflector (+ Kast) at Lick Observatory, shows that 2010kc (CBET 2552) is a type-Ib supernova. SN 2010kg (CBET 2561) is a very young type-Ia supernova. After removal of the host-galaxy recession velocity of 4770 km/s (measured from their own spectrum of the host, NGC 1633), they find the absorption minimum of the Si II 635.5-nm line to be blueshifted by about 21300 km/s. Cross- correlation with a library of supernova spectra using the "SuperNova IDentification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) indicates that 2010kg is a normal type-Ia supernova (consistent with the findings of Marion et al., CBET 2561) and might be as young as 10-14 days before maximum brightness. Extensive follow-up observations are encouraged.