Electronic Telegram No. 3742
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 2013gx
     Vladimir Lipunov, Sternberg Astronomical Institute, reports the discovery
by P. Balanutsa of an apparent supernova (mag 17.8) on four 60-s unfiltered CCD
survey images (limiting mag 19.0) obtained on Nov. 29.52578 UT with the 0.40-m
f/2.5 MASTER-Tunka reflector.  The new object is located at R.A. = 1h02m23s.27,
Decl. = +20d33'21".2 (equinox 2000.0), which is 4" west and 12" south of the
galaxy SDSS J010223.54+203333.1.  Nothing was visible at this position on a
reference image from 2011 Dec. 26.6 (limiting mag 20.0).  The discovery and
reference images are available at the following website URL:
http://master.sai.msu.ru/static/OT/010223.27203321.2.jpg.

     L. Tartaglia, P. Ochner, L. Tomasella, A. Pastorello, S. Benetti, E.
Cappellaro, N. Elias-Rosa, and M. Turatto, Osservatorio Astronomico di Padova,
Istituto Nazionale di Astrofisica, report that an optical spectrogram of
2013gx, obtained on Dec. 6.88 UT with the Asiago 1.82-m Copernico Telescope
(+ AFOSC; range 340-820 nm; resolution 1.3 nm), shows that this is a type-II
supernova at redshift z = 0.024.  A good match is found with several normal
type-IIP supernovae at about one month after the core-collapse.  The expansion
velocity deduced from the wavelength of the H-alpha absorption is about 6600
km/s.  The Asiago classification spectra are posted at the following website
URL:  http://graspa.oapd.inaf.it.  The classification was made via GELATO
(Harutyunyan et al. 2008, A.Ap. 488, 383) and SNID (Blondin and Tonry 2007,
Ap.J. 666, 1024).


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2013 CBAT
2013 December 9                  (CBET 3742)              Daniel W. E. Green