[IAUC] CBET 3358: 20121225 : SUPERNOVA 2012ia = PSN J10354824+3900279

[quai en eps.harvard.edu]

                                                  Electronic Telegram No. 3358
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 2012ia = PSN J10354824+3900279
     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
 2012ia   Dec. 12.52   10 35 48.24  +39 00 27.9    17.4      0".9 E, 0".5 N

The variable was designated PSN J10354824+3900279 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2012ia based on the
spectroscopic confirmation reported below.  Additional CCD magnitudes for
2012ia (unfiltered unless noted otherwise):  June 22.18 UT, [18.0 (CSS);
Dec. 18.294, 17.5 (R. A. Koff, Bennett, CO, USA; Meade 0.25-m f/10 reflector
+ Apogee U-47 camera; limiting magnitude 19.2; position end figures 48s.23,
27".0; UCAC3 reference stars).  Koff's image has been posted at website URL
http://antelopehillsobservatory.org/SNpictures/PSNJ10354824+3900279final.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. 19.33 UT with the Asiago 1.82-m Copernico Telescope
(+ AFOSC), shows that PSN J10354824+3900279 = SN 2012ia is a type-Ia supernova
at redshift z about 0.044.  The best match was found with several type-Ia
supernovae around maximum light.  The expansion velocity, as deduced from the
position of the Si II 635.5-nm absorption, is about 11200 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 3358)              Daniel W. E. Green