Electronic Telegram No. 3457
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 2013az IN ESO 306-16 = PSN J05395213-4030281
     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 Siding Spring Survey (SSS):

 SN       2013 UT       R.A. (2000.0) Decl.      Mag.      Offset
 2013az   Mar. 24.48   5 39 52.13  -40 30 28.1   17.1    15".0 W, 16".9 N

The variable was designated PSN J05395213-4030281 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2013az based on the
spectroscopic confirmation reported below.  Additional CCD magnitudes for
2013az:  2012 Dec. 13.52 UT, [20.0 (SSS); 2013 Mar. 31.408, 18.4 (Joseph
Brimacombe, Cairns, Australia; 41-cm RCOS telescope + infrared filter;
bandpass > 700 nm; position end figures 52s.30, 25".7; image posted at
website URL http://www.flickr.com/photos/43846774@N02/8615998728/).

     E. Y. Hsiao and N. Morrell, Las Campanas Observatory; and G. H. Marion,
Harvard-Smithsonian Center for Astrophysics, report that a near-infrared
spectrogram (range 800-2400 nm) of PSN J05395213-4030281 = 2013az was obtained
on Apr. 1.05 UT with the FoldedPort Infrared Echellette (FIRE) spectrograph on
the 6.5-m Magellan Baade Telescope.  The spectrum shows that 2013az is a
type-Ia supernova near maximum light.  The near-infrared spectrum is similar
to that of SN 2005am at maximum (Marion et al. 2009, A.J. 138, 727).  The
supernova redshift approximately matches the redshift of the presumed host
galaxy (ESO 306-16) at z = 0.037.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2013 CBAT
2013 April 9                     (CBET 3457)              Daniel W. E. Green