Electronic Telegram No. 3443
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 2013ap = PSN J12582492+1235533
     Li Zhou, Xiaofeng Wang, and Juncheng Chen, Tsinghua University (THU);
and Tianmeng Zhang and Xu Zhou, National Astronomical Observatories of China
(NAOC), report the discovery of an apparent supernova (mag 19.5) on unfiltered
CCD images taken on Feb. 18.86 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. = 12h58m24s.92, Decl. = +12d35'53".3 (equinox 2000.0), which is 2".0
east and 1".0 south of the center of the presumed host galaxy.  Nothing is
visible at this position on images obtained on Jan. 17 (limiting mag about
20.0) or on an image from the Palomar Sky Survey.  The TNTS images are posted
at URL http://www.thca.tsinghua.edu.cn/~wangxf/TNTS/PSNJ12582492+1235533.png.
The variable was designated PSN J12582492+1235533 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2013ap based on the
spectroscopic confirmation reported below.  Joseph Brimacombe (Cairns,
Australia) reports magnitude 18.5 and position end figures 24s.91, 52".9
for 2013ap from five 15-min CCD exposures taken with a 51-cm RCOS telescope
(+ luminance filter) on Feb. 22.333; he has posted images at website URL
http://www.flickr.com/photos/43846774@N02/8498238963/.

     Jujia Zhang and Changjun Wang, Yunnan Astronimical Observatory (YNAO);
Xulin Zhao and Xiaofeng Wang, Tsinghua University, China; and Tianmeng Zhang,
NAOC, report on an optical spectrogram (range 350-800 nm) of PSN
J12582492+1235533 = SN 2013ap that was obtained on Mar. 4.83 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 a few days 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 2013ap matches with SN 1994ae at +10 days.  Adopting a redshift of 0.086
for the presumed host galaxy (from the SNID fit), they measure the velocity
of the Si II 635.5-nm absorption feature to be about 10500 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 March 24                    (CBET 3443)              Daniel W. E. Green