2010CBET.2550....1K

R. Kirshner and P. Challis, Harvard-Smithsonian Center for Astrophysics (CfA); and T. Matheson, National Optical Astronomical Observatory, on behalf of the CfA Supernova Group, report on spectroscopic observations (range 320-850 nm) obtained on Nov. 16.3 UT with the MMT (+ blue-channel spectrograph) of the three apparent supernovae announced on CBET 2549. Cross-correlation with a library of supernova spectra using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) indicates that 2010ju is a type-Ia supernova about one week before maximum light; the velocity of the Si II minimum is blueshifted by about 16000 km/s in the supernova's restframe. The spectrogram of 2010jv shows the spectrum of a type-Ia supernova at maximum, with a blueshift of 11000 km/s at the Si II line. The spectrogram of 2010jw has a spectrum that resembles the type-Ic supernova 2004eu at five days past maximum light.