Electronic Telegram No. 3595
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 2013ec = PSN J16275026+4028213
     Li Zhou and Xiaofeng Wang, Tsinghua University (THU); and Tianmeng Zhang,
National Astronomical Observatories of China (NAOC), report the discovery of
an apparent supernova (mag 19.0) on unfiltered CCD images taken on July 2.59
UT using the 0.6-m NAOC Schmidt telescope in the course of the THU-NAOC
Transient Survey (TNTS).  The object was located at R.A. = 16h27m50s.26,
Decl. = +40d28'21".3 (equinox 2000.0), which is 2".3 east and 0".8 north of
the center of the galaxy SDSS J162750.11+402820.4.  Nothing is visible at this
position on a Digitized Sky Survey image from the Palomar Sky Survey (no
date, limiting magnitude, or bandpass provided).  The TNTS image is posted at
URL http://www.thca.tsinghua.edu.cn/~wangxf/TNTS/PSNJ16275026+4028213.png.
The variable was designated PSN J16275026+4028213 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2013ec based on the
spectroscopic confirmation reported below.  Additional CCD magnitudes for
2013ec:  2013 Mar. 24, [20.0 (TNTS); July 8.416, 18.5 (Joseph Brimacombe,
Cairns, Australia; remotely using a 51-cm RCOS telescope + STL11K camera +
luminance filter; position end figures 50s.21, 20".3; image posted at website
URL http://www.flickr.com/photos/43846774@N02/9262930597/).

     J.-J. Zhang, Yunnan Astronimical Observatory (YNAO); and X.-F. Wang,
Tsinghua University, report on an optical spectrogram (range 350-870 nm) of
PSN J16275026+4028213 = SN 2013ec that was obtained on July 15.63 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 a few weeks after 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 2013ec matches with SN 2002bf at +18 days.  Adopting a
redshift 0.081 (from the SNID fit) for the host galaxy of 2013ec, they
measure the velocity of the Si II 635.5-nm absorption feature to be about
12200 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 July 24                     (CBET 3595)              Daniel W. E. Green