Electronic Telegram No. 3714
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 2013gi = PSN J06234727-6519484
     Stuart Parker, Canterbury, New Zealand, reports the discovery of an
apparent supernova (red mag 17.9) on a 30-s unfiltered CCD image (limiting mag
19.0) taken on Nov. 13.606 UT with a 35-cm Celestron C14 reflector (+ ST10
camera) at his Parkdale Observatory in the course of the Backyard Observatory
Supernova Search.  The new object is located at R.A. = 6h23m47s.27, Decl. =
-65d19'48".4 (equinox 2000.0; reference stars from USNO-B and UCAC4
catalogues), which is 1" east and 1" north of the nucleus of the galaxy PGC
75726.  Nothing is visible at this position on Digitized Sky Survey red and
infrared images (limiting red magnitude > 19).  The variable was designated
PSN J06234727-6519484 when it was posted at the Central Bureau's TOCP webpage
and is here designated SN 2013gi based on the spectroscopic confirmation
reported below.

     M. Childress, R. Scalzo, F. Yuan, and B. Schmidt, Australian National
University (ANU); and B. Tucker, ANU and University of California at Berkeley,
report spectroscopic classification of PSN J06234727-6519484 = SN 2013gi with
the Wide Field Spectrograph (WiFeS; cf. Dopita et al. 2007, Ap. Space Sci.
310, 255) on the ANU 2.3-m telescope at Siding Spring, using the B3000/R3000
gratings (wavelength range 350-980 nm at 0.1-nm resolution).  A 40-min WiFeS
spectrogram obtained on Nov. 14 indicates that 2013gi is a type-Ia supernova
past maximum light, with clear Si 635.5-nm, Ca H/K and infrared triplet, the
Fe complex at 500 nm, and the P-Cyg feature historically associated with Na
at 590.0 nm.  Classification with SNID (Blondin and Tonry 2007, Ap.J. 666,
1024) shows best matches to SN 2002ej at phase +10 days and SN 2003cg at
phase +12 days.  Narrow emission lines from the host galaxy (PGC 75726)
indicate the redshift to be z = 0.0301.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2013 CBAT
2013 November 16                 (CBET 3714)              Daniel W. E. Green