Electronic Telegram No. 3442
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 2013ao
     A. J. Drake, S. G. Djorgovski, M. J. Graham, A. A. Mahabal, and R.
Williams, California Institute of Technology; R. H. McNaught, Australian
National University; J. L. Prieto, Princeton University; M. Catelan,
Pontificia Universidad Catolica de Chile; 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
unfiltered Siding Spring Survey (SSS) images:

     SN       2013 UT        R.A. (2000.0) Decl.       Mag.
     2013ao   Mar. 4.77   11 44 44.74  -20 31 41.1     17.0

Nothing is visible at this position on an SSS image from 2012 June 12.45 UT
(limiting mag 19.5).

     Cosimo Inserra and Matt Nicholl, Queen's University, Belfast; Nic Walton
and Nadia Blagorodnova, Institute of Astronomy, University of Cambridge;
Morgan Fraser and Joe Polshaw, Queen's University, Belfast; S. Benetti and A.
Pastorello, Istituto Nazionale di Astrofisica, Padova Astronomical
Observatory; S. Valenti, Las Cumbres Observatory Global Telescope and
University of California at Santa Barbara; S. Taubenberger, Max-Planck-
Institut fuer Astrophysik, Garching; S. J. Smartt, K. Smith, and D. Young,
Queen's University, Belfast; M. Sullivan, University of Southampton; and A.
Gal-Yam and O. Yaron, Weizmann Institute for Science, on behalf of the PESSTO
collaboration (see website URL http://www.pessto.org), report that they
obtained a spectrogram of 2013ao on Mar. 6.2 UT with the European Southern
Observatory's New Technology Telescope (+ EFOSC2 + Grism 13; range 398.5-931.5
nm; 1.8-nm resolution) at La Silla.  The spectrum is consistent with a young
type-Ia supernova.  An excellent match is obtained with several normal type-Ia
supernovae about one week before B-band maximum light at a redshift of 0.03.
The classification was made via GELATO (Harutyunyan et al. 2008, A.Ap. 488,
383) and SNID (Blondin and Tonry 2007, Ap.J. 666, 1024).


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      superseded by text appearing later in the printed IAU Circulars.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 3442)              Daniel W. E. Green