Electronic Telegram No. 3121
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


SUPERNOVA 2012ck = PSN J19192793+4414509
     Further to CBET 3111, M. Kandrashoff, K. Fuller, S. B. Cenko, W. Li, and
A. V. Filippenko report the LOSS discovery of an apparent supernova on
unfiltered KAIT images:

 SN       2012 UT       R.A. (2000.0) Decl.      Mag.      Offset
 2012ck   May 19.47   19 19 27.93  +44 14 50.9   17.9    1".1 E, 1".7 N

The variable was designated PSN J19192793+4414509 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2012ck based on the
spectroscopic confirmation reported below.  Additional KAIT magnitudes for
2012ck:  May 15.50 UT, [18.8; 20.47, 17.9.

     S. B. Cenko, A. V. Filippenko, and J. M. Silverman, University of
California, Berkeley, report that they obtained a CCD spectrum (range 340-1050
nm) of 2012ck on May 21.45 UT with the Kast double spectrograph on the Shane
3-m telescope at Lick Observatory.  The spectrum is dominated by a largely
featureless blue continuum, with superimposed narrow emission lines from the
underlying host galaxy establishing a redshift of 0.042.  These properties are
suggestive of a very young type-II supernova.  Further observations are
encouraged to verify this classification.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2012 CBAT
2012 May 23                      (CBET 3121)              Daniel W. E. Green