[IAUC] CBET 2753: 20110630 : SUPERNOVA 2011du = PSN J18564206+3638107

Mie Sep 14 16:18:47 ART 2011

                                                  Electronic Telegram No. 2753
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 2011du = PSN J18564206+3638107
     Further to CBET 2745, J. Kelly, S. B. Cenko, W. Li, and A. V. Filippenko
report the LOSS discovery of an apparent supernova on unfiltered KAIT images.
The object was designated PSN J18564206+3638107 when posted at the Central
Bureau's TOCP webpage and is here designted SN 2011du based on the
spectroscopic confirmation reported below.

 SN       2011 UT        R.A. (2000.0) Decl.      Mag.      Offset
 2011du   June 23.40   18 56 42.06  +36 38 10.7   18.8    0".5 E, 2".3 S

Additional unfiltered CCD magnitudes for 2011du:  a co-added frame from June 2
to 19 UT, [19.8 (KAIT); June 24.39, 19.1 (KAIT); 26.424, 18.3 (J. Brimacombe,
Cairns, Australia; position end figures 42s.15, 10".9).  Brimacombe's image is
posted at website URL http://www.flickr.com/photos/43846774@N02/5875187042/.

     J. M. Silverman, S. B. Cenko, P. E. Nugent, and A. V. Filippenko,
University of California, Berkeley, report that inspection of a CCD spectrum
(range 340-1000 nm), obtained on June 29 UT with the 10-m Keck I telescope (+
LRIS), shows that PSN J18564206+3638107 = SN 2011du is a type-II supernova.
After removal of the host-galaxy recession velocity of 17600 km/s, determined
from narrow emission features, the absorption minimum of the H-alpha line is
found to be blueshifted by about 12000 km/s.

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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2011 CBAT
2011 June 30                     (CBET 2753)              Daniel W. E. Green