Electronic Telegram No. 2217
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 2010au IN PGC 82347
     R. Arbour, South Wonston, Hants, U.K., reports his discovery of an
apparent supernova (mag 16.7) on an unfiltered CCD images (limiting mag 18.8)
taken on Mar. 15.942 UT using a 0.4-m f/5 reflector (+ Starlight Xpress CCD
camera) in the course of his supernova patrol.  The new object is located at
R.A. = 9h12m36s.39, Decl. = +34o51'17".0 (equinox 2000.0), which is 2".0
east and 1".0 south of the center of the galaxy PGC 82347.  Nothing is
visible at this position on Palomar Sky Survey plates (via the Digitized Sky
Survey) from 1996 Apr. 15 (limiting blue mag 20.6) and 1998 Apr. 21 (limiting
red mag 19.1), or on Arbour's own image taken on 2010 Mar. 3 (limiting mag
19.0).  After posting on the Central Bureau's unconfirmed-objects webpage,
D. Balam, D. Bohlender, E. Chisholm, and D. Monin report that observations
obtained on Mar. 19.16 with the 1.82-m Plaskett telescope (National Research
Council of Canada) confirm a new point source located 2" east and 1" south
of the core of the galaxy; differential magnitudes/colors (using SDSS
filters) of 2010au, using the reference star SDSS J091241.22+345239.8, are
as follows:  g = 17.55 +/- 0.02, g-r = +0.21 +/- 0.04, r-i = -0.80 +/- 0.08.
Also, Arbour relays a report from W. Li (University of California) that a
follow-up image taken on Mar. 21.25 with the Katzman Automatic Imaging
Telescope at Lick Observatory yields mag about 18 and position end figures
36s.33, 16".8; Li adds that nothing is visible at this position on a Sloan
Digital Sky Survey image from 2002 Dec. 31 (limiting mag 22.0).


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2010 CBAT
2010 March 21                    (CBET 2217)              Daniel W. E. Green