Electronic Telegram No. 2709
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 2011bz IN NGC 5442 = PSN J14044453-0943160
     S. Howerton, Arkansas City, KS, U.S.A.; A. J. Drake, S. G. Djorgovski,
A. Mahabal, M. J. Graham, and R. Williams, California Institute of Technology;
J. L. Prieto, Carnegie Observatories; 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 Catalina Real-time Transient Survey's discovery of an apparent
supernova in public images from the Mount Lemmon Survey.

 SN       2011 UT        R.A. (2000.0) Decl.      Mag.      Offset
 2011bz   Apr. 24.34   14 04 43.75  - 9 43 04.7   17.4    19" E, 26" S

Note that Drake has revised the position from that used to automatically
assign the provisional designation (PSN J14044453-0943160) that was given
when this presumed supernova was posted on the Central Bureau's TOCP
webpage; it is here designated SN 2011bz based on the spectroscopic report
below.  Additional unfiltered CCD magnitudes for 2011bz:  Mar. 13.44 UT,
[19.0 (Catalina Sky Survey; via Drake); Apr. 26.240, 17.5 (J. Brimacombe,
Cairns, Australia; remotely using a 51-cm RCOS telescope _ STL11K camera
at the New Mexico Skies Observatory near Mayhill, NM, U.S.A.; position end
figures 43s.60, 02".7); 26.661, 17.4 (Brimacombe; remotely using a 40-cm
RCOS telescope + STL6K camera at the Macedon Ranges Observatory, Melbourne,
Australia; position end figures 43s.62, 03".0).  Brimacombe's first image is
posted at website URL http://www.flickr.com/photos/43846774@N02/5657422949/;
his second image is at http://www.flickr.com/photos/43846774@N02/5659643256/.

     G. H. Marion, Harvard-Smithsonian Center for Astrophysics (CfA), on
behalf of the CfA Supernova Group, report that a spectrum (range 340-740 nm)
of PSN J14044453-0943160 = SN 2011bz was obtained on Apr. 26 UT by M. Calkins
with the F. L. Whipple Observatory 1.5-m telescope (+ FAST).  Cross-
correlation with a library of supernova spectra using the "Supernova
Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) shows
that 2011bz is a type-Ia supernova a few days after maximum light.  The
velocity of the Si II 635.5-nm feature is estimated to be approximately
10700 km/s, using an estimated redshift of z = 0.0291, measured from host-
galaxy emission lines.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2011 CBAT
2011 April 28                    (CBET 2709)              Daniel W. E. Green