Electronic Telegram No. 2841 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 2011gh IN NGC 2405 = PSN J07321603+2554300 S. Howerton, Arkansas City, KS, U.S.A.; A. J. Drake, S. G. Djorgovski, A. Mahabal, M. J. Graham, and R. Williams, California Institute of Technology; J. L. Prieto, Princeton University; M. Catelan, Pontificia Universidad Catolica de Chile; R. H. McNaught and G. Garradd, Australian National University; 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 public images from the Catalina Sky Survey. SN 2011 UT R.A. (2000.0) Decl. Mag. Offset 2011gh Sep. 19.48 7 32 14.94 +25 54 14.6 18.3 12".5 E, 8".7 S Drake originally posted position end figures 16s.03, 30".0 on the Central Bureau's TOCP webpage, and the provisional designation PSN J07321603+2554300 was assigned to this varible; the designation SN 2011gh is assigned here, based on the spectroscopic confirmation reported below. Additional CCD magnitudes for 2011gh (unfiltered unless noted otherwise): Apr. 29.17 UT, [19.5 (Mount Lemmon Survey; via Drake); Sept. 20.476, 19.1 (Joseph Brimacombe, Cairns, Australia); 21.475, R = 19.0 (Brimacombe). Brimacombe's Sept. 20 image is posted at URL http://www.flickr.com/photos/43846774@N02/6167919130/; his Sept. 21 image is at http://www.flickr.com/photos/43846774@N02/6174516626/. S. Valenti, S. Benetti, L. Tomasella, and P. Ochner, Osservatorio Astronomico di Padova, Istituto Nazionale di Astrofisica; and A. Pastorello, Dipartimento di Astronomia, Universita di Padova, on behalf of a larger collaboration, report that a spectrogram (range 360-810 nm; resolution 2.2 nm) of PSN J07321603+2554300 = SN 2011gh, obtained on Sept. 26.10 UT, suggests that it is a type-Ib/c supernova. Cross-correlation with a library of supernova spectra via the "GELATO" code (Harutyunyan et al. 2008, A.Ap. 488, 383; available at URL https://gelato.tng.iac.es/login.cgi), suggests a type-Ib/c supernova a few weeks after B-band maximum. NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2011 CBAT 2011 September 29 (CBET 2841) Daniel W. E. Green