[IAUC] CBET 3411: 20130209 : SUPERNOVA 2013V IN UGC 4798 = PSN J09084154+4448496

Vie Feb 8 22:47:22 ART 2013

                                                  Electronic Telegram No. 3411
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 en eps.harvard.edu (alternate cbat en iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network


SUPERNOVA 2013V IN UGC 4798 = PSN J09084154+4448496
     T. Crowley, J. Newton, and T. Puckett report the discovery of an apparent
supernova (mag 17.8) on unfiltered CCD images (limiting mag 19.0) taken with a
0.40-m reflector at Portal, AZ, U.S.A., on Jan. 6.418 and 7.268 UT in the
course of the Puckett Observatory Supernova Search.  The new object is located
at R.A. = 9h08m41s.54, Decl. = +44o48'49".6 (equinox 2000.0), which is 11".5
west and 11".1 north of the center of UGC 4798.  Puckett has posted an image
of the variable at URL http://www.possdata.com/PSNJ09084154+4448496.jpg.  The
variable was designated PSN J09084154+4448496 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2013V based on the
spectroscopic confirmation reported below.  Additional CCD magnitudes for
2013V:  Jan. 23, [19.0 (Puckett); Feb. 6.456, 17.5 (L. Elenin, Lyubertsy,
Russia; and I. Molotov, Moscow; image obtained remotely with a 0.45-m f/2.8
telescope at the ISON-NM Observatory near Mayhill, NM, USA; position end
figures 41s.64, 49".2, +/- 0".06; UCAC-4 reference stars; image posted at URL
http://spaceobs.org/images/TOCP/PSNJ09084154+4448496-20130206.png; limiting
mag about 19.7); 8.020, R_c = 17.5 (Massimiliano Martignoni, Magnago, Italy;
0.25-m reflector; position end figures 41s.57, 48".4); 8.175, 17.7 (Federica
Luppi and Luca Buzzi, Varese, Italy; 0.38-m f/6.8 reflector; position end
figures 41s.55, 49".5; reference stars from CMC-14 catalogue; image posted at
website URL http://www.astrogeo.va.it/pub/TOCP/PSN_U4798.jpg).

     L. Tomasella, S. Benetti, E. Cappellaro, A. Pastorello, M. Turatto, and
P. Ochner, Osservatorio Astronomico di Padova, Istituto Nazionale di
Astrofisica; and N. Elias-Rosa and A. Morales-Garoffolo, Institut de Ciencies
de l'Espai, IEEC, Consejo Superior de Investigaciones Cientificas, Barcelona,
report that optical spectroscopy (range 340-820 nm; resolution 1.3 nm),
obtained on Feb. 7.03 UT with the Asiago 1.82-m Copernico Telescope (+ AFOSC),
shows that PSN J09084154+4448496 = SN 2013V is a type-Ia supernova.  Adopting
for the host galaxy (UGC 4798) the redshift z = 0.026762 (de Vaucouleurs et
al. 1991, Third Reference Catalogue of Bright Galaxies; via NED), the best
match was found with various type-Ia supernovae -- and, in particular, with
supernova 2003du (Stanishev et al. 2007, A.Ap. 469, 645) more then one week
before maximum light.  The expansion velocity, as deduced from the position of
the Si II 635.5-nm absorption is about 13000 km/s.  The Asiago classification
spectra are posted at website URL http://graspa.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 February 9                  (CBET 3411)              Daniel W. E. Green