Electronic Telegram No. 3576

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 2013dr IN PGC 60077 = PSN J17193026+4742046
     F. Ciabattari, E. Mazzoni, M. Rossi, and G. Petroni, Borgo a Mozzano,
Italy, report their discovery of an apparent supernova (mag 16.3) on
unfiltered CCD images (limiting magnitude 19.5) obtained on June 30.91 and
July 1.85 UT with a 0.5-m Newtonian reflector in the course of the Italian
Supernovae Search Project.  The new object is located at R.A. = 17h19m30s.26,
Decl. = +47d42'04".6 (equinox 2000.0; astrometry with respect to USNO-B
stars), which is 9" west and 5" south of the center of the galaxy PGC 60077.
Nothing is visible at this position on a digitized F plate from the Palomar
Sky Survey taken on 1987 Apr. 24 (limiting magnitude 20.3).  The variable was
designated PSN J17193026+4742046 when it was posted at the Central Bureau's
TOCP webpage and is here designated SN 2013dr based on the spectroscopic
confirmation reported below.  Additional CCD magnitudes for 2013dr:  2013
June 13, [19.2 (Ciabattari); July 4.348, 15.9 (Joseph Brimacombe, Cairns,
Australia; remotely using a 51-cm RCOS telescope + luminance filter located
near Mayhill, NM, U.S.A.; position end figures 30s.18, 03".5; image posted at
website URL http://www.flickr.com/photos/43846774@N02/9216366844/); 6.934, R =
15.2 (Xavier Bros, Ager, Spain; 35-cm f/4.6 telescope; position end figures
30s.23, 04".7; UCAC2 reference stars; image posted at the following website
URL: http://www.anysllum.com/PSN_PGC60077.jpg).

     L. Tomasella, S. Benetti, A. Pastorello, E. Cappellaro, P. Ochner, and M.
Turatto, report that optical spectroscopy (range 340-820 nm; resolution 1.3
nm) obtained on July 2.84 UT with the Asiago 1.82-m Copernico Telescope (+
AFOSC), shows that PSN J17193026+4742046 = SN 2013dr is a type-Ia supernova.
Assuming for the host galaxy, PGC 60077, the redshift z = 0.016835 after Falco
et al. (1999, PASP 111, 438; via NED), a good match is found with several
type-Ia supernovae at one week before maximun light.  The expansion velocity,
as deduced from the position of the minimum of the Si II 635.5-nm absorption,
is about 11200 km/s.  The Asiago classification spectra are posted at website
URL http://sngroup.oapd.inaf.it; 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 July 9                      (CBET 3576)              Daniel W. E. Green