Electronic Telegram No. 3064
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@eps.harvard.edu (alternate cbat@iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network


SUPERNOVA 2012bg
     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.      Offset
 2012bg   Feb. 19.29   11 29 11.20  +36 00 20.6   18.3      0".9 E

Further magnitudes for 2012bg:  Jan. 23.36 UT, [19.0; Feb. 2.29, 18.6; 26.39,
18.3; Mar. 4.22, 18.3; 15.42, 18.3.

     L. Magill, D. Wright, and R. Kotak, Queen's University, Belfast, report
that optical spectroscopy (range 360-1000 nm) of 2012bg was obtained at the
Isaac Newton Telescope (+ IDS) by H. Ledo on Mar. 15.25 UT and was cross-
correlated with a library of supernova spectra using the SNID software
(Blondin and Tonry 2007, Ap.J. 666, 1024), showing 2012bg to be a type-II
supernova.  The best fit was with the type-IIP supernova 2004et at an epoch
of 15-20 days.  Fitting with SNID yields a redshift of 0.033.  The H_alpha
feature displays a broad P-Cyg profile, having a FWHM of 6000 km/s, with a
narrow feature (FWHM = 600 km/s) superimposed on the red side of the broad
emission component.  This narrow feature is centered at the redshift of the
host galaxy.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2012 CBAT
2012 March 21                    (CBET 3064)              Daniel W. E. Green