2010CBET.2386....1V

J. Vinko, University of Szeged; G. H. Marion, Harvard-Smithsonian Center for Astrophysics and University of Texas; and J. C. Wheeler, University of Texas, report that the possible supernova reported on CBET 2385 is indeed a type-Ia supernova. A spectrum, obtained on July 21.28 UT with the 9.2-m Hobby-Eberly Telescope (+ Marcario Low-Resolution Spectrograph) by S. Rostopchin, shows broad features of Si II, S II, Fe II, and Ca II, characteristic of type-Ia supernovae near maximum. According to SNID (Blondin and Tonry 2007, Ap.J. 666, 1024), the best resembling template spectrum is that of SN 1996X, about one week after maximum light. The median redshift estimated by SNID is z = 0.0365 ± 0.0058. Adopting this redshift value, the expansion velocity, from the absorption minimum of the Si II 635.5-nm feature, is 11500 km/s.