2012CBET.3063....1D

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 SN 2012 bf: 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.