Electronic Telegram No. 3129
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 2012co IN UGC 11804 = PSN J21440852+4614511
     J. Newton and T. Puckett report the discovery of an apparent supernova
(mag 17.3) on an unfiltered CCD image (limiting mag 19.0) taken with a 0.40-m
reflector at Portal, AZ, U.S.A., on May 3.476 UT in the course of the Puckett
Observatory Supernova Search.  The new object is located at R.A.
= 21h44m08.52, Decl. = +46o14'51".1 (equinox 2000.0), which is 13".8 west and
5".1 north of the center of UGC 11804.  Puckett has posted an image of the
variable at URL http://www.possdata.com/PSNJ21440852+4614511.jpg.  The
variable was designated PSN J21440852+4614511 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2012co based on the
spectroscopic confirmation reported below.  Additional CCD magnitudes for
2012co:  Apr. 11, [19.1 (Puckett); May 13.422, 17.6 (Puckett); 15.428, 16.9
(R. A. Koff, Bennett, CO, USA; Meade 0.25-m f/10 reflector + unfiltered
Apogee AP-47p camera; limiting magnitude 17.8; position end figures 08s.40,
49".7; UCAC3 reference stars); 15.454, 18.1 (Joseph Brimacombe, Cairns,
Australia; luminance filter; position end figures 08s.51, 50".8); 19.066,
R_c = 17.2 (Massimiliano Martignoni, Magnago, Italy; 0.25-m f/10 reflector;
position end figures 08s.53, 50".6).  Brimacombe's image is posted at
website URL http://www.flickr.com/photos/43846774@N02/7244687060/.

     M. Fraser, R. Kotak, and S. J. Smartt, Queen's University, Belfast,
report that a spectrum (range 330-975 nm; resolution about 1000) of PSN
J21440852+4614511 = 2012co was obtained on May 27.21 UT with the 4.2-m William
Herschel Telescope (+ ISIS).  The spectrum was cross-correlated with a library
of supernova spectra via the "Supernova Identification" code (SNID; Blondin
and Tonry 2007, Ap.J. 666, 1024); a good match was found to several normal
type-Ia supernovae at z = 0.02, approximately 30 days after maximum light.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2012 CBAT
2012 May 29                      (CBET 3129)              Daniel W. E. Green