Electronic Telegram No. 3596
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 2013ed = PSN J16162429+5153057
     T. Boles, Coddenham, England, reports the discovery of an apparent
supernova (mag 16.7) on unfiltered CCD images taken on July 18.024 and 18.947
UT with a 0.35-m reflector.  The new object is located at R.A. = 16h16m24s.29,
Decl. = +51o53'05".7 (equinox 2000.0), which is approximately 4".9 east and
8".4 south of the center of the galaxy SDSS J161623.74+515313.9.  Nothing is
present at this position on Boles' images from 2010 July 5 and 2010 Mar. 8
(limiting mag 19.5) or on Digitized Sky Survey plates from 1992 June 2
(limiting red mag 20.5) and 1990 Apr. 25 (limiting blue mag 21.0).  The
variable was designated PSN J16162429+5153057 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2013ed based on the
spectroscopic confirmation reported below.  Additional CCD magnitudes for
2013ed:  July 19.879, 16.7 (Gianluca Masi and Massimo della Valle, remotely
using a 43-cm robotic telescope at Ceccano, Italy; position end figures
24s.24, 05".4); 19.899, 15.8 (N. James, Chelmsford, Essex, England; Celestron
11 telescope; position end figures 24s.25, 06".0); 19.907, 16.0 (Markku
Nissinen, Kuvansi, Finland; remotely using a 32-cm f/7.9 PlaneWave CDK
telescope + luminance filter + V filter at the iTelescope observatory near
Nerpio, Spain; limiting red mag 18.6; position end figures 24s.23, 05".5).

     D. D. Balam, Dominion Astrophysical Observatory, National Research
Council of Canada; M. L. Graham, Las Cumbres Observatory Global Telescope,
University of California at Santa Barbara; and E. Y. Hsiao, Las Campanas
Observatory, report that a spectrogram (range 369-700 nm, resolution 0.3 nm)
of PSN J16162429+5153057 = SN 2013ed, obtained on July 19.29 UT with the
1.82-m Plaskett Telescope of the National Research Council of Canada, shows it
to be a type-Ia supernova near maximum light.  Cross-correlation with a
library of supernova spectra using the "Supernova Identification" code
(Blondin and Tonry 2007, Ap.J. 666, 1024) indicates that 2013ed is most
similar to the type-Ia supernova 1994ae at one day after maximum.

     M. Dennefeld, Institut Astrophysique de Paris, and Universite Pierre et
Marie Curie, Paris VI; Jari Kajava and Tapio Pursimo, Nordic Optical
Telescope; Jairo Mendez-Abreu, Instituto de Astrofisica de Canarias, La
Laguna, and the NEON school students (cf. IAUC 7664); A. Bonfanti, University
of Padova; A. Dervisoglu, Erciyes University, Kayseri; W. Narloch, Nicolaus
Copernicus Astronomical Center, Warsaw; and M. Zejmo, University of Zielona
Gora, report that a spectrogram of PSN J16162429+5153057 = SN 2013ed was
obtained with the Nordic Optical Telescope (+ ALFOSC) on July 19.98 UT.  The
spectrum (range 350-900 nm, resolution 1.6 nm) shows a typical type-Ia
supernova with strong Si 635.5-nm absorption.  A classification via GELATO
(Harutyunyan et al. 2008, A.Ap. 488, 383) gives a best match with a type-Ia
supernova (e.g., SN 2009dc) at a few days past maximum.  Assuming a recession
velocity of 9941 km/s for the parent galaxy (SDSS J161623.74+515313.9; Berlind
et al. 2006, Ap.J. Supp. 167, 1), the Si 635.5-nm absorption through indicates
an ejection velocity of 5800 km/s.


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

                         (C) Copyright 2013 CBAT
2013 July 24                     (CBET 3596)              Daniel W. E. Green