Electronic Telegram No. 2306 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 2010ds IN IC 4840 J. Maza, M. Hamuy, R. Antezana, L. Gonzalez, P. Gonzalez, S. Silva, G. Folatelli, R. Cartier, F. Forster, S. Marchi, and A. Leal, Universidad de Chile; G. Pignata and M. Cifuentes, Universidad Andres Bello; B. Conuel, Wesleyan University; and D. Reichart, K. Ivarsen, J. Haislip, 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 16.4 +/- 0.3) on an unfiltered image taken on May 22.34 UT with the 0.41-m 'PROMPT 3' telescope located at Cerro Tololo. The new object, which is also present at mag approximately 17.0 in an image taken on June 4.08, is located at R.A. = 19h15m51s.46 +/- 0".1, Decl. = -56o12'30".9 +/- 0".1 (equinox 2000.0), which is about 1".7 west and 1".9 north of the center of the galaxy IC 4840. Nothing is visible at this position on archival images taken on May 1.24 (limiting mag 18.5) and Apr. 22.29 (limiting mag 18.0). NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2010 CBAT 2010 June 4 (CBET 2306) Daniel W. E. Green