Electronic Telegram No. 3526
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 2013cn IN UGC 11076 = PSN J17585034+3400166
     S. Howerton, Arkansas City, KS, U.S.A.; A. J. Drake, S. G. Djorgovski, A.
Mahabal, M. J. Graham, and R. Williams, California Institute of Technology;
J. L. Prieto, Princeton University; M. Catelan, Pontificia Universidad
Catolica de Chile; R. H. McNaught, Australian National University; and E.
Christensen and S. M. Larson, Lunar and Planetary Laboratory, University of
Arizona; report the Catalina Real-time Transient Survey discovery of an
apparent supernova in public images from the Catalina Sky Survey (CSS).

 SN       2013 UT       R.A. (2000.0) Decl.      Mag.      Offset
 2013cn   May 10.39   17 58 50.34  +34 00 16.6   19.5    17".8 W, 4".7 S

The variable was designated PSN J17585034+3400166 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2013cn based on the
spectroscopic confirmation reported below.  Additional CCD magnitudes for
2013cn:  2012 Oct 26.12 UT, [20.2 (CSS); 2013 May 12.24, 19.3 (Joseph
Brimacombe, Cairns, Australia; remotely using a 51-cm RCOS telescope + STL11K
camera + luminance filter at the New Mexico Skies observatory near Mayhill,
NM, U.S.A.; position end figures 50s.56, 17".0; image posted at website URL
http://www.flickr.com/photos/43846774@N02/8736306601/).

     C. McCully and S. W. Jha, Rutgers University, report that a spectrogram
(range 460-980 nm) of 2013cn, taken on May 11.6 UT with the Keck II 10-m
telescope (+ DEIMOS), shows it to be a type-II supernova at a few months after
maximum light.  Cross-correlation of the spectrum with a library of supernova
spectra using the "Supernova Identification" code (SNID; Blondin and Tonry
2007, Ap.J. 666, 1024) yields a best match with the type-IIP supernova 2004et
at 97 days after maximum light, with a redshift consistent with that of the
host galaxy, UGC 11076 (cz = 7463 km/s; Marzke et al. 1996, A.J. 112, 1803).
The trough of the P-Cyg H-alpha profile in SN 2013cn is blueshifted by 4600
km/s relative to the peak of the line profie.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2013 CBAT
2013 May 14                      (CBET 3526)              Daniel W. E. Green