Electronic Telegram No. 3470
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 2013be IN IC 3573 = PSN J12362767+1145281
     Tianmeng Zhang and Xu Zhou, National Astronomical Observatories of China
(NAOC); and Xiaofeng Wang, Li Zhou, and Juncheng Chen, Tsinghua University
(THU), report the discovery of an apparent supernova (mag 19.6) on unfiltered
CCD images taken on Apr. 5.70 UT using the 0.6-m NAOC Schmidt telescope in the
course of the THU-NAOC Transient Survey (TNTS).  The new object is located at
R.A. = 12h36m27s.67, Decl. = +11d45'28".1 (equinox 2000.0), which is 7".1
east and 4".9 south of the center of the galaxy IC 3573.  Nothing is visible
at this position on archival images obtained on Feb. 7 (limiting mag about
20.0) or on a Palomar Sky Survey image.  The TNTS images are posted at website
URL http://www.thca.tsinghua.edu.cn/~wangxf/TNTS/PSNJ12362767+1145281.png.
The variable was designated PSN J12362767+1145281 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2013be based on the
spectroscopic confirmation reported below.  Joseph Brimacombe, Cairns,
Australia, reports magnitude 18.8 and position end figures 27s.67, 27".6
from images obtained remotely with a 51-cm RCOS telescope (+ luminance filter)
located at the New Mexico Skies observatory near Mayhill, NM, USA, on Apr.
7.302; Brimacombe's images habe been posted at the following website URL:
http://www.flickr.com/photos/43846774@N02/8629134753/.

     J. M. Silverman, University of Texas; J. Vinko, University of Szeged;
R. Quimby, Kavli IPMU, University of Tokyo; G. H. Marion, Harvard-Smithsonian
Center for Astrophysics; and J. C. Wheeler and E. Chatzopoulos, University of
Texas, write that a spectrogram, obtained on Apr. 8.19 UT with the 9.2-m
Hobby-Eberly Telescope (+ Marcario Low-Resolution Spectrograph) by J.
Caldwell, shows that PSN J12362767+1145281 = SN 2013be is a type-Ia supernova.
Correlation with a library of supernova spectra using the "SuperNova
IDentification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024)
indicates that 2013be is a normal type-Ia supernova at a few days to one week
before maximum brightness.  After removal of the host-galaxy recession
velocity of 19069 km/s (from their spectrum of the host galaxy), the
absorption minimum of the Si II 635.5-nm line is found to be blueshifted by
about 13500 km/s.  They note, however, that the Si II 635.5-nm profile can be
fitted slightly better by two absorption components at velocities of 17900
and 12700 km/s.


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

                         (C) Copyright 2013 CBAT
2013 April 13                    (CBET 3470)              Daniel W. E. Green