Electronic Telegram No. 3447
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 2013as
     A. J. Drake, S. G. Djorgovski, M. J. Graham, 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 a supernova in unfiltered
Catalina Sky Survey (CSS) images:

 SN       2013 UT        R.A. (2000.0) Decl.      Mag.
 2013as   Mar. 15.32   11 52 52.34  -18 59 19.9   18.1

Nothing is visible at this position on a CSS image from Jan. 13.48 UT
(limiting mag 19.0).  A confirming spectrogram (range 350-800 nm) was taken
with the Palomar 5-m reflector (+ DBSP) on Mar. 15.38; comparison of the
spectrum of 2013as with a library of spectra using the SNID software package
(Blondin and Tonry 2007, Ap.J. 666, 1024) matches the spectrum of the type-Ia
supernova 2002er near maximum light with redshift z = 0.07.

     F. Taddia, Oskar Klein Centre, Stockholm University; and M. Stritzinger,
Department of Physics and Astronomy, Aarhus University, on behalf of the
Carnegie Supernova Project, report that they obtained a visual-wavelength
spectrogram of 2013as with the Nordic Optical Telescope (+ Alfosc).  Close
inspection of the spectrum reveals this to be a normal type-Ia supernova
around maximum light.  Cross-correlation with a library of template spectra
using SNID (Blondin and Tonry 2007, Ap.J. 666, 1024) indicates that 2013as is
at a z = 0.07 and closely resembles SN 2004fu at 3 days after maximum light.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2013 CBAT
2013 March 26                    (CBET 3447)              Daniel W. E. Green