[IAUC] CBET 970: 20070523 : POSSIBLE SUPERNOVA IN MCG +05-43-16

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                                                  Electronic Telegram No. 970
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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POSSIBLE SUPERNOVA IN MCG +05-43-16
     T. Boles, Coddenham, England, reports the discovery of a possible
supernova (mag 18.5) on an unfiltered CCD image taken on May 19.037 UT
with a 0.35-m reflector.  The new object is located at R.A. = 18h23m05s.59
+/- 0s.01, Decl. = +29o54'01".0 +/- 0".2 (equinox 2000.0), which is
approximately 17".9 east and 4".2 south of the center of MCG +05-43-16.
Nothing is visible at this location on Boles' images from 2006 June 30 and
Sept. 18 (limiting mag 19.5) or on Digitized Sky Survey plates from 1989
May 3 (limiting red mag 20.5) and 1990 July 22 (limiting blue mag 21.0),
though there is a faint stellar object or compact luminous area of mag
20.5 within 1" of the possible supernova.  A confirming image of the
variable object by Boles from May 19.973 yielded mag 18.3.
     Following posting on the Central Bureau's unconfirmed-objects webpage,
D. Balam (Dept. of Physics and Astronomy, University of Victoria) writes
that A. Domokos and P. Wiegert obtained three V-band images with the 1.82-m
Plaskett Telescope of the National Research Council of Canada, which show
that there is indeed a new point source of magnitude V = 17.98 (+/- 0.03)
located at the above position, remarking that nothing is visible at this
position on the Palomar Sky Survey II.


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                         (C) Copyright 2007 CBAT
2007 May 23                      (CBET 970)               Daniel W. E. Green