Electronic Telegram No. 2278
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


SUPERNOVA 2010ck IN MCG +06-31-61
     E. Y. Hsiao, N. Suzuki, AND P. E. Nugent, Lawrence Berkeley National
Laboratory; Janos Botyanszki and Joshua Meyers, University of California,
Berkeley; and D. D. Balam, Dominion Astrophysical Observatory, National
Research Council of Canada (NRCC), report that inspection of a low-signal-
to-noise-ratio CCD spectrum (range 330-980 nm), obtained on May 8.46 UT with
the 3-m Shane reflector (+ Kast) at Lick Observatory, shows that 2010ck (cf.
CBET 2263) is a type-II supernova.  The spectrum was taken nearly two weeks
past the discovery date.  The supernova sustained the initially reported
brightness -- measured to have a magnitude V = 16.77 and color B-V = +0.70
on May 11.33 UT with the 1.82-m Plaskett Telescope of the NRCC.  The
"superfit" software of Howell et al. (2005, Ap.J. 634, 1190) identified the
spectrum as that of a young type-II supernova at z = 0.027, which matches
the redshift of the reported host galaxy, MCG +06-31-61.  The spectrum
closely resembles that of SN 1999em, with the H-alpha and H-beta features
visible but still weak.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2010 CBAT
2010 May 12                      (CBET 2278)              Daniel W. E. Green