Electronic Telegram No. 2550
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
CBAT Director:  Daniel W. E. Green; Hoffman Lab 209; Harvard University;
 20 Oxford St.; Cambridge, MA  02138; U.S.A.
e-mail:  cbatiau@eps.harvard.edu (alternate cbat@iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network


SUPERNOVAE 2010ju, 2010jv, AND 2010jw
     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.


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2010 CBAT
2010 November 16                 (CBET 2550)              Daniel W. E. Green