[IAUC] CBET 2683: 20110407 : SUPERNOVA 2011bb = PSN J11352709-3800549

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                                                  Electronic Telegram No. 2683
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 2011bb = PSN J11352709-3800549
     G. Pignata and M. Cifuentes, Universidad Andres Bello; J. Maza, M. Hamuy,
R. Antezana, L. Gonzalez, R. Cartier, F. Forster, S. Silva, F. Carrasco, P.
Sanchez, and C. Hervias, Universidad 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 16.6) on an unfiltered
image taken on Mar. 14.08 UT with the 0.41-m 'PROMPT 1' telescope located at
Cerro Tololo.  The new object, which is also present at mag approximately
17.0 in an image taken on Mar. 8.18, is located at R.A. = 11h35m27s.09 +/-
0".3, Decl. = -38o00'54".9 +/- 0".3 (equinox 2000.0), which is about 2".6
east and 0".7 north of center of the presumed host galaxy.  Nothing is
visible at this position on archival images taken on Feb. 28.15 (limiting
mag 17.5) and Feb. 20.15 (limiting mag 18.0).  The variable was designated
PSN J11352709-3800549 when posted at the Central Bureau's TOCP webpage and
is here designated SN 2011bb based on the spectroscopic report below.

     J. Anderson and F. Forster, Universidad de Chile; and G. Pignata,
Universidad Andres Bello, on behalf of the Millennium Center for Supernova
Science, report on an optical spectrogram (range 355-896 nm) of PSN
J11352709-3800549 = SN 2011bb that was obtained on Mar. 28.07 UT with the
SOAR telescope (+ Goodman HTS).  The spectrum shows 2011bb to be a type-Ia
supernova at about two weeks after maximum light.  Cross-correlation with a
library of supernova spectra using the "Supernova Identification" code
(SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) provides good matches with
SN 1995D at +14 days.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2011 CBAT
2011 April 7                     (CBET 2683)              Daniel W. E. Green