Electronic Telegram No. 2111
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
URL http://www.cfa.harvard.edu/iau/cbat.html


SUPERNOVA 2009nr IN UGC 8255
     Pavel Balanutsa and Vladimir Lipunov, Sternberg Astronomical Institute,
on behalf of the MASTER robotic-telescopes network, report the discovery of
an apparent supernova (mag 13.6) on a 60-s unfiltered CCD image (limiting
mag 16.2 with an Apogee AltaU16m camera) taken on 2009 Dec. 22.901 UT at
Blagoveschensk.  Images (limiting magnitudes V = 17.8, R = 18.1) taken at
Kislovodsk on Dec. 31.1 yield V = 13.1 and R = 13.5 for the new object.  SN
2009nr is located at R.A. = 13h10m58s.95, Decl. = +11d29'29".3 (equinox
2000.0), which is 36" east and 50" north of the center of the galaxy UGC 8255.
Nothing is visible at this position on twenty reference images taken over
the past six years with a robotic telescope near Moscow, including one taken
on 2008 Apr. 2 (limiting red mag 17.5).  The discovery image is posted at
website URL http://observ.pereplet.ru/images/SN31dec09/sn_ugc08255.JPG.
     Following posting on the Central Bureau's unconfirmed-objects webpage,
M. Nissinen and V.-P. Hentunen, Varkaus, Finland, report that they obtained
multiple 120-s R-band images (limiting mag 17.2) of 2009nr remotely on 2010
Jan. 5.76 with the 32-cm Global-Rent-a-Scope telescope GRAS09 (+ SBIG ST-10
CCD camera) at Moorook, Australia, measuring the new object to have magnitude
R = 14.3 and position end figures 58s.97, 29".3 (and the galaxy center's
position end figures 56s.5, 28'39").  Nothing is visible at this position on
a Palomar Sky Survey red F plate (via the Digitized Sky Survey) to limiting
mag 20.8.
     Further to CBET 2095, W. Li, S. B. Cenko, and A. V. Filippenko have
just reported the independent discovery of 2009nr on an unfiltered KAIT image
taken on 2010 Jan. 6.53, providing mag 13.9 and position end figures 58s.94,
29".6.; nothing was visible at this position on a KAIT image from 2009 Apr.
19.18 (limiting mag 19.0).


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2010 CBAT
2010 January 6                   (CBET 2111)              Daniel W. E. Green