Electronic Telegram No. 3425
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 2013ad
     A. J. Drake, M. J. Graham, S. G. Djorgovski, A. A. Mahabal, and R.
Williams, California Institute of Technology; J. L. Prieto, Princeton
University; M. Catelan, Pontificia Universidad Catolica de Chile; and S. M.
Larson and E. Christensen, Lunar and Planetary Laboratory, University of
Arizona, report the Catalina Real-time Transient Survey discovery of an
apparent supernova in unfiltered images from the Catalina Sky Survey (CSS).

 SN       2013 UT       R.A. (2000.0) Decl.      Mag.      Offset
 2013ad   Feb. 15.10   3 38 41.03  +10 18 27.2   17.5    3".9 E, 12".6 N

Nothing was visible at this position on a CSS image from Feb. 5.16 UT
(limiting mag 19.5).

     M. Stritzinger, Department of Physics and Astronomy, Aarhus University;
and F. Taddia, Oskar Klein Centre, Stockholm University, on behalf of the
Carnegie Supernova Project, report that they obtained a visual-wavelength
spectrogram of 2013ad on Feb. 25.9 UT with the Nordic Optical Telescope (+
Alfosc).  The spectrum reveals the transient to be a type-Ia supernova.
Cross-correlation of the NOT spectrum with a library of template spectra using
SNID (Blondin and Tonry 2007, Ap.J. 666, 1024) provides close matches with a
number of normal and 1991T-like type-Ia supernovae, a few days prior to
maximum.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2013 CBAT
2013 March 1                     (CBET 3425)              Daniel W. E. Green