[IAUC] CBET 2982: 20120120 : SUPERNOVA 2012F = PSN J00331954+0348174

Vie Ene 20 03:02:04 ART 2012

                                                  Electronic Telegram No. 2982
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 2012F = PSN J00331954+0348174
     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; E. C. Beshore and S. M.
Larson, Lunar and Planetary Laboratory, University of Arizona; and E.
Christensen, Gemini Observatory, report the discovery of an apparent supernova
in unfiltered Catalina Sky Survey (CSS) images:

 SN       2012 UT       R.A. (2000.0) Decl.      Mag.
 2012F    Jan. 4.11    0 33 19.54  + 3 48 17.4   17.8

The variable was designated PSN J00331954+0348174 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2012F based on the
spectroscopic confirmation reported below.  Additional CCD magnitudes for
2012F (unfiltered unless noted otherwise):  2011 Dec. 16.10 UT, [19.5 (CSS);
25.18, 18.9 (CSS); 2012 Jan. 5.066, R = 17.3 (Joseph Brimacombe, Cairns,
Australia; remotely using a 51-cm RCOS telescope + STL11K camera + red filter
at the New Mexico Skies Observatory near Mayhill, NM, U.S.A.; magnitude
includes supernova plus host-galaxy background light; position end figures
19s.52, 17".3); 7.813, 17.5 (Federica Luppi and Luca Buzzi, Varese, Italy;
0.38-m f/6.8 reflector; position end figures 19s.55, 17".6; reference stars
from CMC-14 catalogue); 14.12, 18.2 (CSS).  Brimacombe's image is posted at
URL http://www.flickr.com/photos/43846774@N02/6641294059/.  Luppi and Buzzi's
image is posted at http://www.astrogeo.va.it/pub/TOCP/PSN_J00331954+0348174.jpg.

     L. Tomasella, E. Cappellaro, P. Ochner, S. Benetti, A. Pastorello, and
S. Valenti, Osservatorio Astronomico di Padova, Istituto Nazionale di
Astrofisica, report that a spectrum (range 360-810 nm; resolution 2.2 nm) of
PSN J00331954+0348174 = SN 2012F was obtained on Jan. 17.78 UT with the
Ekar-Copernico 1.82-m telescope (+ AFOSC).  The spectrum'S main feature is a
strong He absorption measured at 586 nm.  Using a library of supernova spectra
via GELATO (Harutyunyan et al. 2008, A.Ap. 488, 383; available at website URL
https://gelato.tng.iac.es/login.cgi), they found a best fit with several
type-Ib supernovae near maximum at a redshift of z about 0.03.

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2012 CBAT
2012 January 20                  (CBET 2982)              Daniel W. E. Green