Electronic Telegram No. 3580
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 2013dv = PSN J17031073+2726539
     Miguel Hurtado, on behalf of the "La Sagra Sky Survey (LSSS) Supernova
Search Team" (which also includes Denis Vida, Filip Novoselnik, Ivica Skokic,
David Gostinski, Salvador Sanchez, Jaime Nomen, Reiner Stoss, Bill Yeung, and
Juan Rodriguez), reports the discovery of an apparent supernova (magnitude
17.1) on three unfiltered CCD images (limiting mag about 20.0) taken on July
2.905, 2.911, and 2.917 UT with a 0.45-m telescope.  The new object is located
at R.A. = 17h03m10s.73, Decl. = +27d26'53".9 (equinox 2000.0), which is 8"
north of the nucleus of the presumed host galaxy.  Nothing is visible at this
position on a red Digitized Sky Survey plate taken on 1989 May 2.346 UT
(limiting mag about 22).  An LSSS image and the reference DSS image are
posted at website URL http://i.imgur.com/CCfekjw.png; three images from
2013 July 2 have been posted at website URL http://i.imgur.com/QtBiXHx.png.
The variable was designated PSN J17031073+2726539 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2013dv based on the
spectroscopic confirmation reported below.

     D. Milisavljevic and M. R. Drout, Harvard University; and V. A. Villar,
Massachusetts Institute of Technology, report that a low-dispersion spectrum
(range 430-800 nm), obtained on July 7.37 UT with the 2.4-m Hiltner telescope
(+ CCDS) at the MDM Observatory, show PSN J17031073+2726539 = SN 2013dv to be
a type-Ia supernova.  Cross-correlation with a library of supernova spectra
using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J.
666, 1024) shows many reasonable matches with normal type-Ia events around
maximum light.  The best match is with SN 2007fb at two days post-maximum.
After removal of the host-galaxy redshift of z = 0.057 (determined via SNID),
the absorption minimum of the Si II 635.5-nm line is found to be blueshifted
by approximately 11500 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      superseded by text appearing later in the printed IAU Circulars.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 11                     (CBET 3580)              Daniel W. E. Green