Electronic Telegram No. 406 Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A. IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions) CBAT@CFA.HARVARD.EDU (science) URL http://cfa-www.harvard.edu/iau/cbat.html SUPERNOVA 2006ai IN ESO 5-G9 P. Luckas, Perth, W. Australia; O. Trondal, Oslo, Norway; and M. Schwartz, Patagonia, AZ, report the discovery of an apparent supernova on unfiltered CCD frames taken with the 0.35-m Tenagra telescope at Perth on Feb. 17.54 (at mag 16.2) and 19.52 UT (mag 16.0) in the course of the Tenagra Observatory Supernova Search. SN 2006ai is located at R.A. = 7h29m52s.16, Decl. = -84o02'20".5 (equinox 2000.0), which is 2".5 west and 1".8 south of the center of ESO 5-G9 (which itself has position end figures 29m53s.77, 02'18".7). Nothing was visible at the position of 2006ai on an image taken by Luckas on 2005 Dec. 16.79 (limiting magnitude about 18.5). NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2006 CBAT 2006 February 19 (CBET 406) Daniel W. E. Green