Electronic Telegram No. 1529 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://www.cfa.harvard.edu/iau/cbat.html SUPERNOVA 2008gc G. Pignata, J. Maza, M. Hamuy, R. Antezana, L. Gonzalez, P. Gonzalez, P. Lopez, S. Silva, G. Folatelli, D. Iturra, R. Cartier, and F. Forster, Universidad de Chile; and D. Reichart, K. Ivarsen, A. Crain, D. Foster, M. Nysewander, and A. LaCluyze, University of North Carolina at Chapel Hill, on behalf of the CHASE project, report the discovery of an apparent supernova (mag approximately 17.4 +/- 0.2) on an unfiltered image taken on Oct. 3.16 UT with the 0.41-m 'PROMPT 3' telescope located at Cerro Tololo. The new object is located at R.A. = 2h10m36s.63, +/- 0".1, Decl. = -53o45'59".5 +/- 0".1 (equinox 2000), which is about 0".6 west and 0".5 south of center of the apparent host galaxy. SN 2008gc is also present in images taken on Oct. 4.15 at mag approximately 17.3 +/- 0.2 and Oct. 6.04 at mag approximately 17.2. Nothing is visible at this position on archival images taken on June 30.29 (limiting mag 17.5) and July 4.28 (limiting mag 18.0). NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2008 CBAT 2008 October 6 (CBET 1529) Daniel W. E. Green