Electronic Telegram No. 2303
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
CBAT Director:  Daniel W. E. Green; Room 209; Dept. of Earth and Planetary
 Sciences; Harvard University; 20 Oxford St.; Cambridge, MA  02138; U.S.A.
e-mail:  cbat@iau.org; cbatiau@eps.harvard.edu
URL http://www.cfa.harvard.edu/iau/cbat.html


SUPERNOVA 2010dq IN NGC 57
     S. Nakano, Sumoto, Japan, reports the discovery by Koichi Itagaki
(Teppo-cho, Yamagata) of an apparent supernova (mag 17.3) on unfiltered CCD
frames (limiting mag 19.0) taken on June 3.71 UT using a 0.60-m f/5.7
reflector (+ Bitran BT-214E camera).  Itagaki then found a pre-discovery
image of 2010dq at mag 18.0 on an unfiltered CCD frame (limiting mag 18.5)
that he had taken on May 31.748.  The new object is located at R.A. =
0h15m29s.70 +/- 1".7, Decl. = +17d19'41".0 +/- 0".3 (equinox 2000.0), which
is 17" west and 1" south of the center of NGC 57.  Nothing is visible at this
position on Itagaki's many past frames, including one from 2007 Aug. 20.66
(limiting mag 19.0), or on the Digitized Sky Survey.  Itagaki has posted
images of 2010dq at website URL http://www.k-itagaki.jp/images/psn57.jpg.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2010 CBAT
2010 June 3                      (CBET 2303)              Daniel W. E. Green