Electronic Telegram No. 3395
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 2013O = PSN J08520598+5236062
     Tianmeng Zhang and Xu Zhou, National Astronomical Observatories of China
(NAOC); and Juncheng Chen and Xiaofeng Wang, Tsinghua University (THU), China,
report the discovery of an apparent supernova (mag 18.3) on unfiltered CCD
images taken on Jan. 21.70 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. = 8h52m05s.98, Decl. = +52d36'06".2 (equinox 2000.0), which is about
3" north of the center of the galaxy 2MASX J07352516+5152330.  Nothing is
visible at this position on a Digitized Sky Survey image from the Palomar Sky
Survey.  The TNTS image has been posted at the following website URL:
http://www.thca.tsinghua.edu.cn/~wangxf/TNTS/PSNJ08520598+5236062.png.  The
variable was designated PSN J08520598+5236062 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2013O based on the
spectroscopic confirmation reported below.  Additional approximate CCD
magnitudes for 2013O:  Jan. 3, [20.0 (TNTS); 23.401, 17.2 (Joseph Brimacombe,
Cairns, Australia; remotely with a 51-cm RCOS telescope + luminance filter at
the New Mexico Skies Observatory near Mayhill, NM, U.S.A.; position end
figures 06s.01, 05".0).  Brimacombe's image is posted at the following website
URL:  http://www.flickr.com/photos/43846774@N02/8410253794/.

     Jujia Zhang and Changjun Wang, Yunnan Astronomical Observatory (YNAO);
Xulin Zhao and Xiaofeng Wang, Tsinghua University; and Tianmeng Zhang,
National Astronomical Observatories of China, report on an optical spectrogram
(range 340-830 nm) of PSN J08520598+5236062 = SN 2013O that was obtained on
Jan. 22.88 UT with the 2.4-m telescope (+ YFOSC) at the LiJiang Gaomeigu
Station of the YNAO.  The spectrum is consistent with a type-Ia supernova
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 2013O matches with SN 1992A at -1 day.  Adopting
a redshift of 0.053 (from the Sloan Digital Sky Survey; viewable at website
URL http://www.sdss.org/dr2/products/spectra/getspectra.html) for the
presumed host galaxy (SDSS J085205.98+523602.5), they measure the velocity of
the Si II 635.5-nm absorption feature to be about 12700 km/s.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2013 CBAT
2013 February 2                  (CBET 3395)              Daniel W. E. Green