[IAUC] CBET 3407: 20130207 : SUPERNOVA 2013T IN UGC 8250 = PSN J13101968+3228257

Jue Feb 7 13:39:07 ART 2013

                                                  Electronic Telegram No. 3407
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 2013T IN UGC 8250 = PSN J13101968+3228257
     [Editor's note:  this text replaces that on CBET 3405 (designation
changed, as SN 2013R was assigned to another object in CBET 3403).]
     S. Howerton, Arkansas City, KS, U.S.A.; A. J. Drake, S. G. Djorgovski,
A. Mahabal, M. J. Graham. and R. Williams, California Institute of Technology;
J. L. Prieto, Princeton University; M. Catelan, Pontificia Universidad
Catolica de Chile; and E. Christensen and S. M. Larson, Lunar and Planetary
Laboratory, University of Arizona report the Catalina Real-time Transient
Survey discovery of an apparent supernova in public images from the Catalina
Sky Survey (CSS).

 SN       2013 UT        R.A. (2000.0) Decl.      Mag.      Offset
 2013T    Jan. 22.36   13 10 19.68  +32 28 25.7   17.0    5".8 W, 33".8 S

The variable was designated PSN J13101968+3228257 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2013T based on the
spectroscopic confirmation reported below.  Additional CCD magnitudes for
2013T:  2012 June 18.22 UT, [19.0 (CSS); 2013 Jan. 23.014, 17.4 (Federica
Luppi and Luca Buzzi, Varese, Italy; 0.38-m f/6.8 reflector; position end
figures 19s.69, 25".4; reference stars from CMC-14 catalogue; image posted at
website URL http://www.astrogeo.va.it/pub/TOCP/PSN_U8250.jpg); 32.306, 16.5
(L. Elenin, Lyubertsy, Russia; and I. Molotov, Moscow; three stacked 300-s
images remotely taken with a 0.45-m f/2.8 telescope at the ISON-NM
Observatory near Mayhill, NM, USA; position end figures 19s.70 +/- 0".13,
25s.7 +/- 0".10; UCAC-4 reference stars; limiting mag about 19.7; image
posted at http://spaceobs.org/images/TOCP/PSNJ13101968+3228257-20130123.png);
23.512, 17.5 (Joseph Brimacombe, Cairns, Australia; images taken remotely
with a 51-cm RCOS telescope + luminance filter at the New Mexico Skies
observatory near Mayhill; position end figures 19s.73, 25".5; image posted
at website URL http://www.flickr.com/photos/43846774@N02/8409880086/).

     L. Tomasella, S. Benetti, E. Cappellaro, A. Pastorello, M. Turatto, and
P. Ochner, Osservatorio Astronomico di Padova, Istituto Nazionale di
Astrofisica, report that optical spectroscopy (range 340-820 nm; resolution
1.3 nm), obtained on Jan. 31.17 UT with the Asiago 1.82-m Copernico Telescope
(+ AFOSC; range 350-820 nm, resolution 1.3 nm), indicates that PSN
J13101968+3228257 = 2013T is a type-Ia supernova about forty days after
maximum light at redshift z of 0.017646 (Rines et al. 2001, Ap.J. 561, L41;
via NED).  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 7                  (CBET 3407)              Daniel W. E. Green