[IAUC] CBET 3059: 20120321 : SUPERNOVA 2012bb IN PGC 39723 = PSN J12195197-3627261

Mar Mar 20 22:03:14 ART 2012

                                                  Electronic Telegram No. 3059
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 2012bb IN PGC 39723 = PSN J12195197-3627261
     G. Pignata, M. Cifuentes, Y. Apostolovski, and M. Vidal, Universidad
Andres Bello; J. Maza, M. Hamuy, R. Antezana, L. Gonzalez, and R. Cartier, F.
Forster, S. Silva, F. Carrasco, P. Sanchez, C. Hervias, and R. Ramirez,
Universidad de Chile; 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 15.9) on an unfiltered image taken on Feb. 2.19 UT with the
0.41-m 'PROMPT 5' telescope located at Cerro Tololo.  The new object is
located at R.A. = 12h19m51s.97 +/- 0".2, Decl. = -36o27'26".1 +/- 0".2
(equinox 2000.0), which is about 11".4 east and 8".0 north of the center of
the galaxy PGC 39723 (= ESO 380-14).  The variable was designated PSN
J12195197-3627261 when it was posted at the Central Bureau's TOCP webpage and
is here designated SN 2012bb based on the spectroscopic confirmation reported
below.  Additional CCD magnitudes for 2012bb:  2011 May 16.15, [18.5 (CHASE);
2012 Feb. 3.14, 15.6 (CHASE); 10.802, 15.7: (J. Brimacombe, Cairns, Australia;
41-cm RCOS telescope + STL6K camera + infrared filter, bandpass > 700 nm; poor
seeing/transparency; position end figures 52s.02, 27".0; marginal, uncertain
detection); 11.545, 15.8 (Brimacombe; position end figures 52s.01, 26".6;
image posted at URL http://www.flickr.com/photos/43846774@N02/6860587117/).
Brimacombe notes that there is an area of brightening at the approximate
position of 2012bb in a Digitized Sky Survey image.

     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 J12195197-3627261 = SN 2012bb is a type-IIP supernova at about 2-3 weeks
after maximum light.


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 3059)              Daniel W. E. Green