[IAUC] CBET 2404: 20100811 : POSSIBLE SUPERNOVA IN GALAXY IN DRACO

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                                                  Electronic Telegram No. 2404
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 en iau.org; cbatiau en eps.harvard.edu
URL http://www.cfa.harvard.edu/iau/cbat.html


POSSIBLE SUPERNOVA IN GALAXY IN DRACO
     S. Nakano, Sumoto, Japan, reports the discovery by Koichi Itagaki
(Teppo-cho, Yamagata) of an apparent supernova (mag 16.4) on unfiltered
CCD frames (limiting magnitude 19.0) taken on Aug. 9.705 UT using a 0.60-m
f/5.7 reflector (+ Bitran BT-214E camera).  The new object is located at
R.A. = 17h58m22s.56 +/- 0s.02, Decl. = +50o47'34".0 +/- 0".4 (equinox
2000.0), near a small and faint galaxy.  Toru Yusa (Osaki, Japan) reports
his confirming images (limiting mag 18-19) of the new object taken remotely
at the RAS Observatory near Mayhill, NM, U.S.A., on Aug. 10.148 and 10.169,
providing position end figures 22s.56 +/0 0s.01, 34".6 +/- 0".1.  Additional
unfiltered CCD magnitudes for the variable, including pre-discovery images
found by Itagaki from his archive:  2008 Aug. 31.50, [19.5 (Itagaki); 2010
Aug. 3.614, 17.5 (Itagaki); 6.576, 16.9 (Itagaki); 10.148, 16.0 (Yusa,
0.30-m f/12 reflector + FLI IMG1024-DM camera); 10.169, 16.0 (Yusa, 0.25-m
f/3.4 reflector + SBIG ST-10XME camera); 10.446, 16.2 (Itagaki); 10.527,
16.3 (Yusa, 0.30-m f/12 Cassegrain reflector + SBIG STL-1001E camera at
Osaki, Japan).  Itagaki's pre- and discovery images of the new variable are
posted at website URL http://www.k-itagaki.jp/images/psn-anon-2.jpg.  Also,
Yusa has posted an image of the variable at the following website URL:
http://www.palette.furukawa.miyagi.jp/space/images/PSN_100810.jpg.  The
faint presumed host galaxy is SDSS J175822.33+504733.1.
     Following posting on the Central Bureau's unconfirmed-objects webpage,
Vitali Nevski (Vitebsk, Belarus) writes that he obtained CCD images on Aug.
10.880 with a 0.3-m reflector that yield magnitude 15.8 and position end
figures 22s.58, 34".7 (USNO-B1.0 catalogue) for the possible supernova,
adding that nothing is visible at this position on a Palomar Sky Survey
image obtained on 1993 Aug. 16 (via the Digitized Sky Survey; limiting red
mag 21).


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                         (C) Copyright 2010 CBAT
2010 August 11                   (CBET 2404)              Daniel W. E. Green