[IAUC] CBET 3356: 20121225 : SUPERNOVA 2012hz = PSN J06434189+5212337

Lun Dic 24 21:30:32 ART 2012

                                                  Electronic Telegram No. 3356
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 2012hz = PSN J06434189+5212337
     A. J. Drake, S. G. Djorgovski, M. J. Graham, A. Mahabal, and R. Williams,
California Institute of Technology; J. L. Prieto, Princeton University; M.
Catelan, Pontificia Universidad Catolica de Chile; and S. M. Larson and E.
Christensen, Lunar and Planetary Laboratory, University of Arizona, report the
discovery of an apparent supernova in unfiltered Catalina Sky Survey (CSS)
images:

 SN       2012 UT        R.A. (2000.0) Decl.       Mag.      Offset
 2012hz   Dec. 10.21    6 43 41.89  +52 12 33.7    17.6    6".6 W, 28".8 N

The variable was designated PSN J06434189+5212337 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2012hz based on the
spectroscopic confirmation reported below.  Further CCD magnitudes for 2012hz
(unfiltered unless noted otherwise):  Oct. 10.45 UT, [19.2 (CSS); Nov. 5.67,
[18.4 (D. Denisenko, E. Gorbovskoy, and V. Lipunov, Sternberg Astronomical
Institute; MASTER-Amur images); Dec. 12.88, 18.5 (Denisenko et al.; four 60-s
survey images taken with the 0.40-m f/2.5 MASTER-Kislovodsk robotic telescope;
position end figures 41s.86, 34".4, +/- 0".3"; images posted at website URL
http://master.sai.msu.ru/static/OT/PSNJ06434189+5212337-MASTER-Kislovodsk.jpg);
17.324, 18.9 (R. A. Koff, Bennett, CO, USA; Meade 0.25-m f/10 reflector +
Apogee U-47 camera; limiting magnitude 19.8; position end figures 41s.98,
34".5; UCAC3 reference stars); 17.508, 18.6 (Joseph Brimacombe, Cairns,
Australia; remotely using a 51-cm RCOS telescope + luminance filter at the New
Mexico Skies Observatory near Mayhill, NM, U.S.A.; position end figures 41s.97,
34".7); 19.148, 18.9 (Federica Luppi and Luca Buzzi, Varese, Italy; 0.38-m
f/6.8 reflector; position end figures 41s.98, 34".8; reference stars from
NOMAD catalogue).  The image by Luppi and Buzzi is posted at the following
website URL:  http://www.astrogeo.va.it/pub/TOCP/PSN_J06434189+5212337.jpg.

     M. Turatto, S. Benetti, L. Tomasella, A. Pastorello, E. Cappellaro, 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 Dec. 19.01 UT with the Asiago 1.82-m Copernico Telescope
(+ AFOSC), shows that PSN J06434189+5212337 = SN 2012hz is a type-Ia supernova
at redshift z about 0.043.  The best match was found with the type-Ia
supernova 1994D (Patat et al. 1996, MNRAS 278, 111) about two weeks after
maximum light.  The expansion velocity, as deduced from the position of the
Si II 635.5-nm absorption, is about 8600 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 2012 CBAT
2012 December 25                 (CBET 3356)              Daniel W. E. Green