Electronic Telegram No. 977                                               
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 2007co IN MCG +05-43-16
Joel Nicolas, Vallauris, France, reports his discovery of an
apparent supernova (mag 16.6) on a CCD images obtained on June 4.978 and 
6.935 UT with a 0.36-m Schmidt-Cassegrain telescope, noting that the
object is not present on the Palomar Sky Survey. Nicolas gives the
position of the new object as R.A. = 18h23m03s.6, Decl. = +29o53'49".6
(equinox 2000.0 presumed but not stated), noting it to be 8" east and
15" south of the nucleus of MCG +05-43-16. Concerned about the presence
of SN 2007ck (cf. CBETs 970 and 971) in the same galaxy, discovered just
last month, the Central Bureau posted the report on its unconfirmed-
objects webpage and sought confirmation from recognized supernova
observers. In response, T. Orff reports that a six co-added 30-s
unfiltered CCD images (limiting mag 19.5) taken in Portal, AZ, with a
0.4-m Schmidt-Cassegrain telescope on June 6.245 shows this new object
(now designated 2007co) at mag 16.4 located at position end figures
03".60, 49".7, the offset given as 8".1 west and 14".9 south of the
galaxy's center; Orff adds that 2007ck appears at mag 17.5 on this same
image, and that nothing is visible at the location of 2007co on Palomar
Sky Survey images from 1989 and 1990. Also, W. Li (University of
California at Berkeley) reports that an unfiltered KAIT CCD image taken
at Lick Observatory on June 7.343 shows 2007co at mag 16.7 with position
end figures 03s.60, 49".5 (equnox 2000.0), the offset given measured to
be 7".4 west and 15".7 south of the galaxy's nucleus --- adding that
2007ck is also visible and that 2007co is not visible on the Digitized
Sky Survey.

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superseded by text appearing later in the printed IAU Circulars.

(C) Copyright 2007 CBAT
2007 June 7 (CBET 977) Daniel W. E. Green