Electronic Telegram No. 2697
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 2011bo IN ESO 337-6 = PSN J18593846-4145558
     J. Maza, M. Hamuy, R. Antezana, L. Gonzalez, R. Cartier, F. Forster, S.
Silva, F. Carrasco, P. Sanchez, and C. Hervias, Universidad de Chile; G.
Pignata and M. Cifuentes, Universidad Andres Bello; C. Farias, 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 17.6) on unfiltered images taken on
Mar. 21.34 and 23.36 UT with the 0.41-m 'PROMPT 5' telescope located at
Cerro Tololo.  The new object (which was designated PSN J18593846-4145558
when posted on the Central Bureau's TOCP webpage and is here designated
SN 2011bo based on the spectroscopic report below) is located at R.A. =
18h59m38s.46 +/- 0".2, Decl. = -41o45'55".8 +/- 0".2 (equinox 2000.0), which
is about 8".1 west and 9".3 south of center of the galaxy ESO 337-6.
Nothing is visible at this position on archival images taken prior to this
year (limiting mag 18.5).
     Joseph Brimacombe, Cairns, Australia, reports the following unfiltered
CCD magnitudes for 2011bo from images taken remotely with a 40.6-cm RCOS
telescope (+ U9000 camera) at the Macedon Ranges Observatory, near Melbourne,
Australia:  Mar. 28.364 UT, 18.8 (position end figures 38s.61, 55".4);
Apr. 6.784, 18.6 (position end figures 38s.60, 55".2).  Brimacombe has posted
his images at URLs http://www.flickr.com/photos/43846774@N02/5575391553/ and
http://www.flickr.com/photos/43846774@N02/5601625686/.

     N. Morrell, Las Campanas Observatory; J. Anderson and F. Forster,
Universidad de Chile; and G. Pignata, Universidad Andres Bello, on behalf of
the Millennium Center for Supernova Science, report that they have obtained a
spectrum (range 420-900 nm) of PSN J18593846-4145558 = SN 2011bo on Mar. 29.4
UT with the Magellan Baade 6.5-m telescope (+ IMACS) at Las Campanas
Observatory.  The spectrum indicates that 2011bo is a type-Ic supernova around
two weeks after maximum; comparison with template spectra using the "Supernova
Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) provides
a close match to that of SN 1991N at twelve days after maximum light.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2011 CBAT
2011 April 12                    (CBET 2697)              Daniel W. E. Green