[IAUC] CBET 3291: 20121109 : SUPERNOVA 2012gc IN NGC 7298 = PSN J22305042-1411163

[quai en eps.harvard.edu]

                                                  Electronic Telegram No. 3291
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 2012gc IN NGC 7298 = PSN J22305042-1411163
     Greg Bock, Windaroo, Queensland, Australia, reports his discovery of an
apparent supernova (red mag 17.4) on an unfiltered CCD image (limiting
magnitude 18.5) taken on Nov. 5.42 UT with a 35-cm Meade LX200R reflector (+
ST10 camera) in the course of the Backyard Observatory Supernova Search (BOSS).
The new object is located at R.A. = 22h30m50s.42, Decl. = -14d11'16".3
(equinox 2000.0; reference stars from the USNOB and UCAC3 catalogues), which
is 4" west and 1" north of the center of the galaxy NGC 7298.  Nothing is
visible at this position on Bock's image from 2011 Oct. 22 or on Digitized Sky
Survey red and infrared images (limiting red mag > 19).  The variable was
designated PSN J22305042-1411163 when it was posted at the Central Bureau's
TOCP webpage and is here designated SN 2012gc based on the spectroscopic
confirmation reported below.

     L. Tomasella, S. Benetti, E. Cappellaro, A. Pastorello, M. Turatto, and
M. Fiaschi Osservatorio Astronomico di Padova, Istituto Nazionale di
Astrofisica, report that optical spectroscopy (range 340-820 nm; resolution
1.3 nm), obtained on Nov. 5.84 UT with the Asiago 1.82-m Copernico Telescope
(+ AFOSC; range 350-820 nm; resolution 1.3 nm), shows that PSN
J22305042-1411163 = SN 2012gc is a reddened type-II supernova a few days
after explosion at redshift z = 0.01679 (de Vaucouleurs et al. 1991, RC3;
via NED database).  Broad Balmer lines of H are clearly detected (H-alpha
has a FWHM of about 11000 km/s).  The Asiago classification spectra are
posted at website URL http://graspa.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      superseded by text appearing later in the printed IAU Circulars.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 2012 CBAT
2012 November 9                  (CBET 3291)              Daniel W. E. Green