Electronic Telegram No. 3702
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 2013gf = PSN J09052646+5624124
     Tianmeng Zhang and Xu Zhou, National Astronomical Observatories of China
(NAOC); and Xiaofeng Wang, Jun Mo, and Juncheng Chen, Tsinghua University
(THU), report the discovery of an apparent supernova (mag 18.3) on unfiltered
CCD images taken on Nov. 6.87 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. = 9h05m26s.46, Decl. = +56d24'12".4 (equinox 2000.0), which is 8".4 east
and 0".6 south of the center of the presumed host galaxy, which is itself
close to MCG +9-15-84.  Nothing is visible at this position on archival
images obtained on 2012 Nov. 25 (limiting mag about 20.0) or on a Digitized
Sky Survey image from the Palomar Sky Survey.  The TNTS images are posted at
URL http://www.thca.tsinghua.edu.cn/~wangxf/TNTS/PSNJ09052646+5624124.png.
The variable was designated PSN J09052646+5624124 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2013gf based on the
spectroscopic confirmation reported below.  Gianluca Masi, Francesca Nocentini,
and Patrick Schmeer obtained follow-up observations of 2013gf remotely on Nov.
9.074 with a 35-cm robotic telescope near Ceccano, Italy, yielding mag 18.5
and position end figures 26s.32, 11".8.

     J.-J. Zhang, Yunnan Astronimical Observatory (YNAO); and X.-F. Wang,
Tsinghua University, report on an optical spectrogram (range 360-820 nm) of
PSN J09052646+5624124 = SN 2013gf that was obtained on Nov. 7.79 UT with the
2.4-m telescope (+ YFOSC) at the LiJiang Gaomeigu Station of YNAO.  The
spectrum is consistent with a type-Ia supernova at around maximum light.
Cross-correlation with a library of supernova spectra using the "Supernova
Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) shows
that 2013gf matches with SN 2003ic at +3 days.  The redshift of the host
galaxy is estimated as about 0.1 from the SNID fit.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2013 CBAT
2013 November 11                 (CBET 3702)              Daniel W. E. Green