Electronic Telegram No. 2873 Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION CBAT Director: Daniel W. E. Green; Hoffman Lab 209; Harvard University; 20 Oxford St.; Cambridge, MA 02138; U.S.A. e-mail: cbatiau@eps.harvard.edu (alternate cbat@iau.org) URL http://www.cbat.eps.harvard.edu/index.html Prepared using the Tamkin Foundation Computer Network SUPERNOVA 2011ha Vladimir Lipunov, Sternberg Astronomical Institute, reports the discovery by P. Balanutsa of the discovery of an apparent supernova (mag 18.5) on unfiltered CCD images (limiting mag 19.4-19.5) taken on Sept. 30.87 and 30.90 UT in the course of the MASTER Net project (http://observ.pereplet.ru/) at the MASTER-Tunka observatory. The new object is located at R.A. = 3h57m40s.87, Decl. = +10d09m55s.2 (equinox 2000.0 presumed), which is 5".3 east and 17".8 south of the center of the presumed host galaxy (which they identify as PGC 1375631). Nothing is visible at this position on an unfiltered image taken at the MASTER-Kislovodsk observatory on 2010 Sept. 18.96 (limiting mag 19.6). An image of the variable, which is designated SN 2011ha based on the spectroscopic confirmation reported below, is posted at the following website URL: http://observ.pereplet.ru/images/SN110830/PSN_PGC1375631/S1.png. P. Ochner, S. Valenti, S. Benetti, A. Pastorello, and L. Tomasella, Istituto Nazionale di Astrofisica (INAF), Osservatorio Astronomico di Padova; and F. Bufano, INAF, Osservatorio Astronomico di Catania, on behalf of a larger collaboration, report that a spectrum of SN 2011ha, obtained on Oct. 18.33 UT with the New Technology Telescope (+ EFOSC2; range 360-930 nm; resolution 1.8 nm), shows it to be a type-Ia supernova. Cross-correlation with a library of supernova spectra using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) suggests a normal type-Ia supernova about 10 days after its B-band maximum at a redshift z = 0.094. The expansion velocity derived from the Si II 635.5-nm minimum is then about 10600 km/s. NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2011 CBAT 2011 October 26 (CBET 2873) Daniel W. E. Green