Electronic Telegram No. 3520
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 2013cj IN UGC 10685 = PSN J17045295+1255104
     Zhangwei Jin, Ningbo, Zhejiang, China; and Xing Gao, Urumqi, Xinjiang,
China, report the discovery of a possible supernova on two 40-s unfiltered
survey CCD images (limiting mag about 19.5) taken by Xing Gao in the course of
the Xingming Sky Survey around May 9.879 (when the object appeared at mag
18.1) and 10.661 UT (at mag 17.4) using a 35-cm f/6.9 Celestron C14 Schmidt-
Cassegrain telescope at Mt. Nanshan.  The new object is approximately located
at R.A. = 17h04m52s.95, Decl. = +12d55'10".4 (equinox 2000.0), which is about
22" east and 18".6 south of the center of PGC 59557.  Nothing is visible at
this position on a red Digitized Sky Survey image from 1989 Apr. 6 (limiting
mag about 19.8).  Their images are posted at the following website URL:
http://www.xjltp.com/XOSS/XM45ZJ/XM45ZJ.htm.  The variable was designated PSN
J17045295+1255104 when it was posted at the Central Bureau's TOCP webpage and
is here designated SN 2013cj based on the spectroscopic confirmation reported
below.  Additional CCD magnitudes for 2013cj:  2013 May 4, [19.5 (Jin and
Gao); May 11.890, V = 17.26 (Seiichiro Kiyota, Tsukuba, Japan; remotely with
an iTelescope.net 0.43-m f/6.8 astrograph + SBIG STL-11000M camera located
at Nerpio, Spain; position end figures are 52s.96, 09".4; image posted at URL
http://meineko.sakura.ne.jp/ccd/PSN_J17045295+1255104.jpg).

     C. McCully and S. W. Jha, Rutgers University, report that a spectrogram
(range 460-980 nm) of PSN J17045295+1255104 = SN 2013cj, taken on May 11.5 UT
with the Keck II 10-m telescope (+ DEIMOS), shows it to be a type-IIn
supernova at an early epoch.  The spectrum features a blue continuum with
broad and narrow emission lines of H-alpha and H-beta; weak, narrow
emission from He I 706.8-nm and He I 587.6-nm; and somewhat unusally, a
strong, narrow emission line of He II 468.6-nm.  The lines are consistent with
the host-galaxy redshift of cz = 9641 km/s as reported by Springob et al.
(2005, Ap.J.S. 160, 149) and cataloged in NED.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2013 CBAT
2013 May 12                      (CBET 3520)              Daniel W. E. Green