Electronic Telegram No. 3528
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 2013cp = PSN J1619522+3856079
     Kaicheng Zhang, Xiaofeng Wang, Li Zhou, and Juncheng Chen, Tsinghua
University (THU), China; and Tianmeng Zhang and Xu Zhou, National Astronomical
Observatories of China (NAOC), report the discovery of an apparent supernova
(mag 18.5) on unfiltered CCD images taken on May 7.69 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. = 16h19m52s.22, Decl. = +38d56'07".9 (equinox
2000.0), which is 11".0 east and 1".0 south of the presumed host galaxy.
Nothing is visible at this position on a Digitized Sky Survey image (no
bandpass or limiting magnitude provided).  The TNTS images are posted at URL
http://www.thca.tsinghua.edu.cn/~wangxf/TNTS/PSNJ16195222+3856079.png).  The
variable was designated PSN J1619522+3856079 when it was posted at the Central
Bureau's TOCP webpage and is here designated SN 2013cp based on the
spectroscopic confirmation reported below.  Additional CCD magnitudes for
2013cp:  Mar. 24, [20.0 (TNTS); May 9.300, 18.1 (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
52s.00, 08".4; image posted at the following website URL:
http://www.flickr.com/photos/43846774@N02/8731351862/).

     J. M. Silverman, University of Texas; J. Vinko, University of Szeged; R.
Quimby, Kavli IPMU, University of Tokyo; and J. C. Wheeler, University of
Texas, write that a spectrogram, obtained on May 11.21 UT with the 9.2-m
Hobby-Eberly Telescope (+ Marcario Low-Resolution Spectrograph) by S.
Rostopchin, shows that PSN J1619522+3856079 = SN 2013cp is a type-Ia supernova.
Correlation with a library of supernova spectra using the "SuperNova
IDentification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) indicates
that 2013cp is a normal type-Ia supernova one week after maximum brightness.
After removal of the host-galaxy recession velocity of 22461 km/s (from narrow
emission lines), the absorption minimum of the Si II 635.5-nm line is found to
be blueshifted by about 10800 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 May 15                      (CBET 3528)              Daniel W. E. Green