2010CBET.2217....1A

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. = 9:12:36.39, Decl. = +34:51:17.0 (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).