Electronic Telegram No. 3336
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 2012hm
     Tianmeng Zhang and Xu Zhou, National Astronomical Observatories of China
(NAOC); and Li Zhou, Juncheng Chen, and Xiaofeng Wang, Tsinghua University
(THU), China, report the discovery of an apparent supernova (mag 17.8) on
unfiltered CCD images taken on Dec. 7.64 UT using the 0.6-m NAOC Schmidt
telescope in the course of THU-NAOC Transient Survey (TNTS).  The variable is
located at R.A. = 2h33m23s.32, Decl. = +39d40'16".9 (equinox 2000.0), which is
about 5".0 east and 4".0 north of the center of the presumed host galaxy.
Nothing is visible at this position on archival images obtained on Nov. 29
(limiting mag about 19.5) or on Digitized Sky Survey images from the Palomar
Sky Survey.

     J.-J. Zhang, Yunnan Astronimical Observatory (YNAO); X.-L. Zhao and X.-F.
Wang, Tsinghua University; and T.-M. Zhang, National Astronomical
Observatories of China, report on an optical spectrogram (range 350-850 nm)
that was obtained on Dec. 9.5 UT with the 2.4-m telescope (+ YFOSC) at the
LiJiang Gaomeigu Station of the YNAO.  The spectrum is consistent with a
type-Ia supernova a few days before maximum light.  Cross-correlation with a
library of supernova spectra using the "Supernova Identification" code (SNID;
Blondin and Tonry 2007, Ap.J. 666, 1024) shows that 2012hm matches with
SN 2002cu at -6 days.  Adopting a recession velocity 10867 km/s for the host
galaxy (VI Zw 214; Huchra et al. 2012, Ap.J. Suppl. 199, 26), they measure the
velocity of the Si II 635.5-nm absorption feature to be about 14000 km/s.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2012 CBAT
2012 December 10                 (CBET 3336)              Daniel W. E. Green