Electronic Telegram No. 2915 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 2011ie = PSN J23005471+1850323 H. Mikuz and B. Dintinjana, Crni Vrh Observatory, report the discovery of a possible supernova (mag 17.0) by Jan Vales on four unfiltered CCD images (bandpass roughly equivalent to the R band) taken on Nov. 17.780-17.825 UT with the 60-cm f/3.3 Cichocki reflector in the course of the Comet and Asteroid Search Program (PIKA) at Crni Vrh Observatory. The new object is located at R.A. = 23h00m54s.71, Decl. = +18o50'32".3 (equinox 2000.0; uncertainty about 0".2), which is approximately 6" east and 4" south of the center of a nearby galaxy. Nothing is visible at this position on several Digitized Sky Survey red and blue images from the Palomar Sky Survey. The discovery image is posted at the following website URL: http://www.observatorij.org/vstars/PSN20111117/PSN20111117.jpg. The variable was designated PSN J23005471+1850323 when it was posted at the Central Bureau's TOCP webpage and is here designated SN 2011ie based on the spectroscopic confirmation reported below. Additional CCD magnitudes for 2011ie (unfiltered unless noted otherwise): 2009 Sept. 27, [18.0 (PIKA; R filter); 2011 Oct. 3, [19.5 (PIKA; unfiltered); Nov. 18.752, R = 17.03 +/- 0.05 (Dintinjana and Mikuz; photometry somewhat contaminated by nearby galaxy); 20.12, 17.3 (R. A. Koff, Bennett, CO, USA; Meade 0.25-m f/10 reflector + Apogee AP-47p camera; limiting magnitude 20.3; position end figures 54s.71, 32".4; UCAC3 reference stars); 21.772, R = 16.7 +/- 0.1 (B. Dintinjana and S. Maticic). S. Valenti, A. Pastorello, S. Benetti, L. Tomasella, F. Bufano, and P. Ochner, Istituto Nazionale di Astrofisica, Osservatorio Astronomico di Padova, on behalf of a larger collaboration, report that a spectrogram of PSN J23005471+1850323 = SN 2011ie, obtained on Nov. 20.85 UT with the 1.82-m Copernico Telescope (+ AFOSC; range 340-790 nm, resolution 2.2 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 that 2011ie is similar to SN 1994D at a few days before maximum. Adopting a redshift of z = 0.031, the velocity of the ejected material, deduced from the minimum of the Si II 635-nm line, is about 11300 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 November 23 (CBET 2915) Daniel W. E. Green