Electronic Telegram No. 2308 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 2010du IN UGC 11170 Further to CBET 2301, S. B. Cenko, W. Li, and A. V. Filippenko, University of California, report the LOSS discovery of an apparent supernova on unfiltered KAIT images: SN 2010 UT R.A. (2000.0) Decl. Mag. Offset 2010du May 25.48 18 13 58.75 +21 30 15.7 18.8 33".7 W, 20".1 S Additional KAIT magnitudes for SN 2010du in UGC 11170: a co-added image from 2009 Oct. 17 to 2010 May 5, [20.2; 2010 June 5.44, 18.6. NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2010 CBAT 2010 June 6 (CBET 2308) Daniel W. E. Green