[IAUC] CBET 3412: 20130209 : SUPERNOVA 2013W IN UGC 5448 = PSN J10063402+1425578

Vie Feb 8 23:01:45 ART 2013

                                                  Electronic Telegram No. 3412
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 2013W IN UGC 5448 = PSN J10063402+1425578
     R. Gagliano, J. Newton, and T. Puckett report the discovery of an
apparent supernova (mag 18.0) on unfiltered CCD images (limiting mag 19.0)
taken with a 0.40-m reflector at Portal, AZ, U.S.A., on Jan. 6.302 UT in the
course of the Puckett Observatory Supernova Search.  The new object is located
at R.A. = 10h06m34s.02, Decl. = +14o25'57".8 (equinox 2000.0), which is 11".2
east and 3".4 south of the center of UGC 5448 (southern component).  A finder
image can be viewed at URL http://www.possdata.com/PSNJ10063402+1425578.jpg,
as posted by Puckett.  The variable was designated PSN J10063402+1425578 when
it was posted at the Central Bureau's TOCP webpage and is here designated SN
2013W based on the spectroscopic confirmation reported below.  Additional
CCD magnitudes for 2013W:  Jan. 9, [19.0 (Puckett); 7.239, 17.9 (Puckett;
limiting mag 19.0); Feb. 8.003, R_c = 17.8 (Massimiliano Martignoni, Magnago,
Italy; 0.25-m reflector; position end figures 33s.88, 58".6); 8.166, 18.1
(Federica Luppi and Luca Buzzi, Varese, Italy; 0.38-m f/6.8 reflector;
position end figures 34s.0, 58".7; reference stars from CMC-14 catalogue;
image posted at URL http://www.astrogeo.va.it/pub/TOCP/PSN_U5448.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. 7.08 UT with the Asiago 1.82-m Copernico Telescope (+ AFOSC),
of PSN J10063402+1425578 = 2013W indicates that it is a type-IIn supernova.
Prominent narrow-but-resolved hydrogen Balmer lines are visible in emission,
and H-alpha shows a composite profile.  The narrow component (FWHM about 400
km/s) is superimposed on a broader one (FWHM about 8000 km/s).  From the
position of the Balmer-line peaks, they derive a redshift z of about 0.03 for
the parent galaxy, which is in agreement with z = 0.030027 given for the host
galaxy, UGC 5448 (Mahdavi and Geller 2004, Ap.J. 607, 202; via NED).  The
Asiago classification spectra are posted at the following 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 3412)              Daniel W. E. Green