Electronic Telegram No. 3456
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 2013ay IN IC 4745 = PSN J18423786-6456135
     M. Hamuy, R. Antezana, L. Gonzalez, R. Cartier, F. Forster, S. Silva, F.
Carrasco, P. Sanchez, C. Hervias, and R. Ramirez, Universidad de Chile; G.
Pignata, Y. Apostolovski, E. Paillas, and S. Varela, Universidad Andres Bello;
F. Aros, Pontificia Universidad Catlica de Chile; B. Conuel, Wesleyan
University; G. Folatelli, IPMU, University of Tokyo; and D. E. Reichart, J. B.
Haislip, J. P. Moore, and A. P. LaCluyze, University of North Carolina at
Chapel Hill, on behalf of the CHASE project (which is part of the Millennium
Center for Supernova Science collaboration), report the discovery of an
apparent supernova (mag approximately 15.1) on an unfiltered image taken on
Mar. 26.29 UT with the 0.41-m 'PROMPT 1' telescope located at Cerro Tololo.
The new object is located at R.A. = 18h42m37s.86 +/- 0".2, Decl. =
-64o56'13".5 +/- 0".2 (equinox 2000.0), which is about 12".7 east and 21".3
north of the center of the galaxy IC 4745.  The variable was designated PSN
J18423786-6456135 when it was posted at the Central Bureau's TOCP webpage and
is here designated SN 2013ay based on the spectroscopic confirmation reported
below.  Additional CCD magnitudes for 2013ay:  2012 Sept. 29.08, [18.2
(CHASE; year assumed); 2013 Mar. 26.29, 15.2 (CHASE); 29.680, 16.4 (Joseph
Brimacombe, Cairns, Australia; 41-cm RCOS telescope + infrared filter;
bandpass > 700 nm; position end figures 37s.97, 13".4; image posted at URL
http://www.flickr.com/photos/43846774@N02/8600797843/); 30.802, 16.7
(Brimacombe; position end figures 37s.90, 13".4; image posted at website URL
http://www.flickr.com/photos/43846774@N02/8611320611/).

     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 J18423786-6456135 = 2013ay was obtained
on Apr. 1.34 UT with the FoldedPort Infrared Echellette (FIRE) spectrograph on
the 6.5-m Magellan Baade Telescope.  The spectrum shows that 2013ay is a
type-Ia supernova a few days past maximum light.  The near-infrared spectrum
is similar to that of SN 2000dk at 5 days past maximum (Marion et al. 2009,
A.J. 138, 727).  The supernova redshift approximately matches the redshift of
the presumed host galaxy (IC 4745) at z = 0.016.


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 3456)              Daniel W. E. Green