[IAUC] CBET 2685: 20110410 : SUPERNOVA 2011bd IN NGC 6473 = PSN J17470632+5718047

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                                                  Electronic Telegram No. 2685
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 2011bd IN NGC 6473 = PSN J17470632+5718047
     A. Langoussis, J. Newton, and T. Puckett report the discovery of an
apparent supernova (mag 16.0) on unfiltered CCD images (limiting mag 19.1)
taken with a 0.40-m reflector at Portal, AZ, U.S.A., on Mar. 24.479 UT, in the
course of the Puckett Observatory Supernova Search.  The new object was
designated PSN J17470632+5718047 when posted on the Central Bureau's TOCP
webpage and is designated SN 2011bd here based on the spectroscopic report
below.  SN 2011bd is located at R.A. = 17h47m06s.32, Decl. = +57o18'04".7
(equinox 2000.0), which is 5".9 east and 0".2 south of the center of NGC 6473.
Puckett has posted an image at http://www.possdata.com/PSNJ17470632+5718047.jpg.
Additional unfiltered CCD magnitudes for 2011bd:  Mar. 20, [18.9 (Puckett);
25.507, 16.0 (Puckett); 29.460, 16.2 (Joseph Brimacombe, Cairns, Australia;
remotely using a 51-cm RCOS telescope + STL11K camera at New Mexico Skies
Observatory, Mayhill, NM, U.S.A.); Apr. 2.154, 16.5: (Xavier Bros, Ager,
Spain, 0.35-m telescope; position end figures 06s.51, 03".2).  Brimacombe
has posted his image at http://www.flickr.com/photos/43846774@N02/5576401868/.

     G. H. Marion, Harvard-Smithsonian Center for Astrophysics (CfA), on
behalf of the CfA Supernova Group, reports that a spectrum (range 340-740 nm)
of PSN J17470632+5718047 = SN 2011bd was obtained on Apr. 2 UT by Marion 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 2011bd is a type-Ia
supernova a few days after maximum light.  Using an estimated redshift of z =
0.0281, measured from host-galaxy emission lines, the velocity of the Si II
635.5-nm feature is estimated to be approximately 10400 km/s.


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                         (C) Copyright 2011 CBAT
2011 April 10                    (CBET 2685)              Daniel W. E. Green