[IAUC] CBET 1182: 20071228 : SUPERNOVA 2007sv IN UGC 5979

Vie Dic 28 15:00:27 ART 2007

                                                  Electronic Telegram No. 1182
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS en CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT en CFA.HARVARD.EDU (science)
URL http://www.cfa.harvard.edu/iau/cbat.html


SUPERNOVA 2007sv IN UGC 5979
     G. Duszanowicz, Akersberga, Sweden, reports his discovery of an
apparent supernova (mag 17.4) on unfiltered CCD exposures (limiting mag
18.5) taken on Dec. 20.912 UT with a 0.32-m f/3.1 reflector (+
Starlight Xpress MX716 CCD camera).  The new object is located at R.A. =
10h52m40s.05 +/- 0s.04, Decl. = +67o59'14".2 +/- 0".7 (equinox 2000.0;
mean of measurements from Dec. 20, 26, and 28 images), which is
6".9 west and 6".7 south of the center of UGC 5979.  Nothing appeared at
this position on a CCD image by Duszanowicz on Sept. 13.093 (limiting
mag 18.8).  A confirming unfiltered CCD image (limiting mag 18.0) was
obtained by T. Boles on Dec. 25.971, showing 2007sv at mag 17.4 and
position end figures 40s.08, 14".5.  Duszanowicz additionally obtained
300-s unfiltered CCD images on Dec. 26.829 (very poor sky conditions)
and 28.135 (limiting mag 19.4) showing the new object at mag 17.6 (only
a few tenths of a magnitude above his limit) and 17.1, respectively.
Following posting on the CBAT's unconfirmed-objects webpage, P. Corelli
(Pagnacco, Italy) writes that his thirty co-added 30-s images (limiting
mag 18.8) taken on Dec. 27.855 with a 0.45-m f/4.5 telescope show 2007sv
at mag 17.4; comparison with a red Digitized Sky Survey image shows
nothing at the position of the new object (limiting mag presumed to be
20-21).


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2007 CBAT
2007 December 28                 (CBET 1182)              Daniel W. E. Green