Electronic Telegram No. 2916 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 2011if = PSN J10061104+2509015 T. Kryachko, S. Korotkiy, and B. Satovskiy, Astrotel Observatory, Kazan State University, report the discovery of an apparent supernova (mag approximately 18.5) on five unfiltered CCD images (limiting mag 21.0) obtained on Oct. 31.07 UT with a 30-cm Takahashi FRC-300 telescope (+ Apogee Alta U9000 camera) at Karachay-Cherkessia, Russia. The new object is located at R.A. = 10h06m11s.04 +/- 0".1, Decl. = +25d09'01".5 +/- 0".1 (equinox 2000.0), which is about 1".5 west and 3".3 north of the center of the galaxy PGC 1726998 (whose position end figures are 11s.19, 08'58".2). Nothing is visible at this position on the Sloan Digital Sky Survey. The discovery image is posted at website URL http://www.astroalert.su/files/psn_j10061104_2509015_.png. The variable was designated PSN J10061104+2509015 when it was posted at the Central Bureau's TOCP webpage and is here designated SN 2011if based on the spectroscopic confirmation reported below. Additional magnitudes for 2011if: 1991 Apr. 6, [21.0 (Palomar Sky Survey, red plate, via the Digitized Sky Survey; via Kryachko et al.); 2011 Nov. 16.476, 19.4 (Joseph Brimacombe, Cairns, Australia; position end figures 11s.02, 01".5; image posted at website URL http://www.flickr.com/photos/43846774@N02/6351538760/). 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 low-signal-to-noise spectrogram of PSN J10061104+2509015 = SN 2011if, obtained on Nov. 21.12 UT with the 1.82-m Copernico Telescope (+ AFOSC; range 340-790 nm, resolution 2.2 nm), suggests that 2011if is a type-II supernova. The best fit to this spectrum, found using a library of supernova spectra via GELATO (Harutyunyan et al. 2008, A.Ap. 488, 383; available at https://gelato.tng.iac.es/login.cgi), indicates that 2011if is similar to SN 1980K at a phase of a few weeks after maximum. NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars.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 2916) Daniel W. E. Green