Electronic Telegram No. 3060
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 2012bc = PSN J0581499-4634315
     J. Maza, M. Hamuy, R. Antezana, L. Gonzalez, R. Cartier, F. Forster, S.
Silva, F. Carrasco, P. Sanchez, C. Hervias, and R. Ramirez, Universidad de
Chile; G. Pignata, M. Cifuentes, Y. Apostolovski, and M. Vidal, Universidad
Andres Bello; F. Aros, Pontificia Universidad Catolica de Chile; B. Conuel,
Wesleyan University; G. Folatelli, IPMU, University of Tokyo; and D. Reichart,
K. Ivarsen, J. Haislip, A. Crain, D. Foster, M. Nysewander, and A. LaCluyze,
University of North Carolina at Chapel Hill, on behalf of the CHASE project
(which is part of the Millennium Center for Supernova Science collaboration),
report the discovery of an apparent supernova (mag approximately 17.8) on an
unfiltered image taken on Feb. 3.27 UT with the 0.41-m 'PROMPT 1' telescope
located at Cerro Tololo.  The new object is located at R.A. = 10h58m14s.99
+/- 0".2, Decl. = -46o34'31".5 +/- 0".2 (equinox 2000.0).  The variable was
erroneously designated PSN J0581499-4634315 when it was posted at the Central
Bureau's TOCP webpage and is here designated SN 2012bc based on the
spectroscopic confirmation reported below.  Additional CHASE magnitudes for
2012bc:  Jan. 25.18, [18.0; Feb. 4.07, 17.7; 21.10, 18.3.

     N. Morrell, Las Campanas Observatory; J. Anderson, Universidad de Chile;
G. Pignata, Universidad Andres Bello; and G. Folatelli, Kavli IPMU, University
of Tokyo, on behalf of the Millenium Center for Supernova Science and Carnegie
Supernova Project collaboration, report on optical spectroscopy (range 370-940
nm) obtained on Mar. 2 UT with the 6.5-m Magellan II Clay telescope (+ LDSS3).
The data were cross-correlated with a library of supernova spectra using the
Supernova Identification Code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024).
PSN J0581499-4634315 = SN 2012bc is a normal type-Ia supernova at
approximately 3 weeks past maximum brightness.


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      superseded by text appearing later in the printed IAU Circulars.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 3060)              Daniel W. E. Green