Electronic Telegram No. 2982 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 2012F = PSN J00331954+0348174 A. J. Drake, S. G. Djorgovski, M. J. Graham, A. Mahabal, and R. Williams, California Institute of Technology; J. L. Prieto, Princeton University; M. Catelan, Pontificia Universidad Catolica de Chile; E. C. Beshore and S. M. Larson, Lunar and Planetary Laboratory, University of Arizona; and E. Christensen, Gemini Observatory, report the discovery of an apparent supernova in unfiltered Catalina Sky Survey (CSS) images: SN 2012 UT R.A. (2000.0) Decl. Mag. 2012F Jan. 4.11 0 33 19.54 + 3 48 17.4 17.8 The variable was designated PSN J00331954+0348174 when it was posted at the Central Bureau's TOCP webpage and is here designated SN 2012F based on the spectroscopic confirmation reported below. Additional CCD magnitudes for 2012F (unfiltered unless noted otherwise): 2011 Dec. 16.10 UT, [19.5 (CSS); 25.18, 18.9 (CSS); 2012 Jan. 5.066, R = 17.3 (Joseph Brimacombe, Cairns, Australia; remotely using a 51-cm RCOS telescope + STL11K camera + red filter at the New Mexico Skies Observatory near Mayhill, NM, U.S.A.; magnitude includes supernova plus host-galaxy background light; position end figures 19s.52, 17".3); 7.813, 17.5 (Federica Luppi and Luca Buzzi, Varese, Italy; 0.38-m f/6.8 reflector; position end figures 19s.55, 17".6; reference stars from CMC-14 catalogue); 14.12, 18.2 (CSS). Brimacombe's image is posted at URL http://www.flickr.com/photos/43846774@N02/6641294059/. Luppi and Buzzi's image is posted at http://www.astrogeo.va.it/pub/TOCP/PSN_J00331954+0348174.jpg. L. Tomasella, E. Cappellaro, P. Ochner, S. Benetti, A. Pastorello, and S. Valenti, Osservatorio Astronomico di Padova, Istituto Nazionale di Astrofisica, report that a spectrum (range 360-810 nm; resolution 2.2 nm) of PSN J00331954+0348174 = SN 2012F was obtained on Jan. 17.78 UT with the Ekar-Copernico 1.82-m telescope (+ AFOSC). The spectrum'S main feature is a strong He absorption measured at 586 nm. Using a library of supernova spectra via GELATO (Harutyunyan et al. 2008, A.Ap. 488, 383; available at website URL https://gelato.tng.iac.es/login.cgi), they found a best fit with several type-Ib supernovae near maximum at a redshift of z about 0.03. NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2012 CBAT 2012 January 20 (CBET 2982) Daniel W. E. Green