[IAUC] CBET 3126: 20120527 : SUPERNOVA 2012cm

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                                                  Electronic Telegram No. 3126
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 en eps.harvard.edu (alternate cbat en iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network


SUPERNOVA 2012cm
     Tomoki Morokuma, Institute of Astronomy, University of Tokyo; Nozomu
Tominaga, Kensho Mori, Konan University; Masaomi Tanaka and Nobuharu Ukita,
National Astronomical Observatory of Japan; Shigeyuki Sako, Noriyuki Matsunaga,
Mamoru Doi, Naoto Kobayashi, Takashi Miyata, Nobuyuki Ienaka, Yoshikazu Nakada,
Tsutomu Aoki, Takao Soyano, Ken'ichi Tarusawa, and Hiroyuki Mito, Institute of
Astronomy, University of Tokyo; Michael W. Richmond, Rochester Institute of
Technology; and Ryosuke Itoh, Koji S. Kawabata, Katsutoshi Takaki, Issei Ueno,
and Hiroshi Akitaya, Hiroshima University, on behalf of the Kiso Supernova
Survey (KISS) project, report the discovery of an apparent supernova (mag
16.8) on a g-band CCD image (limiting mag 20.5) taken on May 13.56 UT with the
Kiso Wide-Field Camera (KWFC; field-of-view 2.1 deg x 2.1 deg) on the 1.05-m
Kiso Schmidt telescope at Kiso Observatory.  The new object is located at R.A.
= 9h10m05s.45, Decl. = +20d12'45.1" (equinox 2000.0), which is 1.2" east and
0.5" south of the presumed host galaxy (SDSS J091005.37+201245.6; at z =
0.0282, from the SDSS database).  Nothing is detected at this position on
reference images taken before 2012 Apr. 28 (limiting mag 20.2).  The
discovery and reference images are available at the following website URL:
http://www.ioa.s.u-tokyo.ac.jp/kisohp/KISS/images/iauc_J091005.45+201245.1.jpg.
Additional g-band magnitudes for 2012cm:  May 14.54, 16.7; 16.46, 16.5.

     Ryosuke Itoh, Koji S. Kawabata, Katsutoshi Takaki, Issei Ueno, and
Hiroshi Akitaya, Hiroshima University; Masaomi Tanaka, National Astronomical
Observatory of Japan; Tomoki Morokuma, Institute of Astronomy, University of
Tokyo; and Nozomu Tominaga and Kensho Mori, Konan University, report that a
low-resolution optical spectrum (range 450-900 nm) of 2012cm was obtained on
May 17.5 UT with HOWPol on the 1.5-m Kanata telescope at Higashi-Hiroshima
Observatory.  Cross-correlation with a library of supernova spectra via the
SNID code (Blondin and Tonry 2007, Ap.J. 666, 1024) shows a best fit with
several normal type-Ia supernovae before maximum, showing clear Si II, S II,
and Fe III features.


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

                         (C) Copyright 2012 CBAT
2012 May 27                      (CBET 3126)              Daniel W. E. Green