Electronic Telegram No. 2345 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 2010ew M. Peoples, J. Newton, and T. Puckett report the discovery of an apparent supernova (mag 16.6) on unfiltered CCD images (limiting mag 18.5) taken with a 0.40-m reflector at Portal, AZ, U.S.A., on June 28.39 UT in the course of the Puckett Observatory Supernova Search. The new object, which was confirmed at mag 16.6 on images (limiting mag 19.8) taken by P. Mortfield and S. Cancelli on June 29.48 with a 0.40-m reflector at Sierra Remote Observatories in California, is located at R.A. = 18h37m11s.88, Decl. = +30o37'49".6 (equinox 2000.0), which is 4".6 west and 7".1 north of the center of the presumed host galaxy. Nothing is visible at this position on images taken by Puckett on June 13 (limiting mag 19.1); however, T. Orff reports a precovery image (limiting magnitude of 18.5) taken by Puckett on June 20, which shows 2010ew at mag 17.1. NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2010 CBAT 2010 July 1 (CBET 2345) Daniel W. E. Green