Electronic Telegram No. 3744
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 2013gz IN UGC 10976 = PSN J17462770+3042132
     Giancarlo Cortini, Predappio, Italy, reports the discovery of a possible
supernova (mag about 17.7) on several 90-s unfiltered CCD exposures (limiting
mag about 18.5) taken on Dec. 2.73 UT with a 0.35-m f/5.5 Schmidt-Cassegrain
reflector (+ SXVR-H9 camera).  The new object is located at R.A. =
17h46m27s.70, Decl. = +30d42'13".2 (equinox 2000.0), which is 2".8 west and
4".9 south of the center of the galaxy UGC 10976.  Nothing is visible at this
position on Palomar Sky Survey red and blue plates.  The variable was
designated PSN J17462770+3042132 when it was posted at the Central Bureau's
TOCP webpage and is here designated SN 2013gz based on the spectroscopic
confirmation reported below.  Additional CCD magnitudes for 2013gz:  2013
Aug. 15.90 and Sept. 25.98, [18.5 (Cortini); Dec. 4.693, 16.3 (Gianluca Masi,
Francesca Nocentini, and Patrick Schmeer; remotely using a 43-cm telescope
near Ceccano, Italy; position end figures 27s.70, 13".1).

     L. Tartaglia, S. Benetti, L. Tomasella, P. Ochner, A. Pastorello, E.
Cappellaro, M. Turatto, and N. Elias-Rosa, Osservatorio Astronomico di Padova,
Istituto Nazionale di Astrofisica, report that an optical spectrogram (range
340-820 nm; resolution 1.3 nm) of PSN J17462770+3042132 = SN 2013gz, obtained
on Dec. 7.70 UT with the Asiago 1.82-m Copernico Telescope (+ AFOSC), shows it
to be a type-Ia supernova.  Adopting for the host galaxy (UGC 10976) a
redshift z = 0.0164 (Karachentsev et al. 1985, Bull. Inform. CDS, 29; via NED),
a good match is found with type-Ia supernovae at one month after maximum light.
The Asiago classification spectra are posted at http://sngroup.oapd.inaf.it;
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      superseded by text appearing later in the printed IAU Circulars.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 3744)              Daniel W. E. Green