[IAUC] CBET 2696: 20110412 : SUPERNOVA 2011bn = PSN J16164236+0014299

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                                                  Electronic Telegram No. 2696
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 2011bn = PSN J16164236+0014299
     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 discovery via the Catalina Real-time Transient Survey (CRTS) of
an apparent supernova in public images from the Catalina Sky Survey (CSS).
This variable was designated PSN J16164236+0014299 when posted on the Central
Bureau's TOCP webpage and is here designated SN 2011bn based on the
spectroscopic confirmation reported below.

 SN       2011 UT       R.A. (2000.0) Decl.      Mag.      Offset
 2011bn   Mar. 8.46   16 16 42.36  + 0 14 29.9   18.9    17".9 W, 16".9 S

Further unfiltered CCD magnitudes for 2011bn:  Feb. 11.52 UT, [19.7 (CSS);
Mar. 9.50, 17.9 (remotely using a 0.5-m LB-1 telescope near Rodeo, NM, U.S.A.,
by the CRTS team); 10.430, 18.0 (Joseph Brimacombe, Cairns, Australia;
remotely using a 51-cm RCOS telescope + STL11K camera at New Mexico Skies
Observatory, Mayhill, NM, U.S.A.; position end figures 42s.54, 28".6).
Brimacombe has posted his image at the following website URL:
http://www.flickr.com/photos/43846774@N02/5515332321/.

     L. Tomasella and S. Benetti, Istituto Nazionale di Astrofisica (INAF),
Osservatorio Astronomico di Padova; and F. Bufano, INAF, Osservatorio
Astronomico di Catania, on behalf of a larger collaboration, report that a
spectrum of 2011bn = PSN J16164236+0014299, obtained on Apr. 10.41 UT with
the New Technology Telescope (+ EFOSC2; range 340-750 nm, resolution 1.3 nm),
shows it to be a type-II supernova.  The best fits to this noisy spectrum found
by GELATO (Harutyunyan et al. 2008, A.Ap. 488, 383; publicly available at
https://gelato.tng.iac.es) are with spectra of type-II supernovae at about one
month post explosion, adopting a recession velocity of 9183 km/s for UGC 10306
(Bottinelli et al. 1993, A.Ap. 102, 57; via NED).


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 2696)              Daniel W. E. Green