Electronic Telegram No. 3063
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 2012bf
     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 a supernova in
unfiltered Catalina Sky Survey (CSS) images:

 SN       2012 UT        R.A. (2000.0) Decl.      Mag.      Offset
 2012bf   Feb. 10.43   15 13 41.81  +16 06 06.6   18.5      0".9 E

Further CSS magnitudes for 2012bf:  Jan. 20.50 UT, [21.4; Feb. 23.53, 18.2;
Mar. 2.44, 18.6; Mar. 15.51, 19.2.  A spectrogram (range 380-1000 nm) of
2012bf was taken on Feb. 29 UT with the Keck-I telescope (+ LRIS); cross-
correlation with a library of spectra using the "Supernova Identification"
code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) shows 2012bf to best
match the type-Ia supernova 2004eo at two days past maximum light.  The
redshift based on the SNIDs matches is approximately z = 0.07.

     L. Magill, D. Wright, and R. Kotak, Queen's University, Belfast, report
that optical spectroscopy (range 360-1000 nm) of 2012bf was obtained at the
Isaac Newton Telescope (+ IDS) by H. Ledo on Mar. 15.21 UT and was cross-
correlated with a library of supernova spectra using the SNID software,
showing 2012bf to be a type-Ia supernova.  The best fit was with the normal
type-Ia supernova 2004eo (Mazzali et al. 2008, MNRAS 386, 1897) at an epoch
of 12-14 days.  Fitting with SNID yielded a redshift of 0.07.


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
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                         (C) Copyright 2012 CBAT
2012 March 21                    (CBET 3063)              Daniel W. E. Green