Electronic Telegram No. 2333
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
CBAT Director:  Daniel W. E. Green; Room 209; Dept. of Earth and Planetary
 Sciences; Harvard University; 20 Oxford St.; Cambridge, MA  02138; U.S.A.
e-mail:  cbat@iau.org; cbatiau@eps.harvard.edu
URL http://www.cfa.harvard.edu/iau/cbat.html


SUPERNOVAE 2010ee, 2010ei, AND 2010ek
     J. M. Silverman, C. V. Griffith, M. T. Kandrashoff, and A. V. Filippenko,
University of California, Berkeley, report that inspection of a low-signal-to-
noise-ratio CCD spectrum (range 340-1000 nm), obtained on June 18 UT with the
3-m Shane reflector (+ Kast) at Lick Observatory, shows that 2010ee (CBET
2326) is a type-II supernova; H-alpha has a well-developed P-Cyg profile.
After removal of the host-galaxy recession velocity of 8500 km/s, determined
from narrow emission features, the absorption minimum of the H-alpha line is
found to be blueshifted by about 5500 km/s.
     SN 2010ei (CBET 2329) is a type-II supernova, probably of subtype IIb,
1-2 weeks after the explosion.  After removal of the host-galaxy recession
velocity of 5600 km/s, determined from narrow emission features, the
absorption minimum of the H-alpha line is found to be blueshifted by about
16300 km/s.  However, this may be a slight overestimate if H-alpha has some
residual blending with Si II 635.5 nm, which was seen at a similar velocity
in the type-IIb supernova 2003bg at one week past explosion (Hamuy et al.
2009, Ap.J. 703, 1612).
     SN 2010ek (CBET 2329) is a type-IIb supernova a few days before maximum
brightness.  Cross-correlation with a library of supernova spectra using the
"SuperNova IDentification" code (SNID; Blondin and Tonry 2007, Ap.J. 666,
1024) indicates that 2010ek is 4 days before maximum.  After removal of the
host-galaxy recession velocity of 9400 km/s, determined from narrow emission
features, the absorption minimum of the H-alpha line is found to be
blueshifted by about 11500 km/s.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2010 CBAT
2010 June 20                     (CBET 2333)              Daniel W. E. Green