Electronic Telegram No. 2712 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 2011cc IN IC 4612 = PSN J16334944+3915487 Further to CBET 2699, M. Mason, S. B. Cenko, W. Li, and A. V. Filippenko report the LOSS discovery of an apparent supernova on unfiltered KAIT images: SN 2011 UT R.A. (2000.0) Decl. Mag. Offset 2011cc Mar. 17.52 16 33 49.44 +39 15 48.7 17.7 2".3 W, 0".9 N This object was designated PSN J16334944+3915487 when posted at the Central Bureau's TOCP webpage and is here designated SN 2011cc based on the spectroscopic report below. Additional KAIT magnitudes for 2011cc: 2010 Sept. 13.16 UT, [19.1 (KAIT); 2011 Apr. 17.51, 17.6 (KAIT). Joseph Brimacombe, Cairns, Australia, reports this a red-filtered image taken remotely with a 51-cm RCOS telescope at the New Mexico Skies Observatory near Mayhill, NM, U.S.A., on Apr. 18.471 shows 2011cc at position end figures 49s.48, 47".8, noting that the variable was too close to the galaxy core to get easy photometry. A. V. Filippenko and J. M. Silverman, University of California, Berkeley, report that inspection of a CCD spectrum (range 340-1000 nm), obtained by A. J. Barth (University of California, Irvine) on May 2 UT with the 3-m Shane reflector (+ Kast) at Lick Observatory, shows that PSN J16334944+3915487 = SN 2011cc is a type-IIn supernova. Although the spectrum is somewhat contaminated by host-galaxy light, H-alpha is seen in emission with an unresolved (FWHM about 470 km/s) component (centered at a recession velocity of 9460 km/s), an intermediate (FWHM about 2600 km/s) component, and a broad (FWHM about 13600 km/s) component. Furthermore, strong Ca II triplet emission is seen along with possible broad He I emission and a narrow He I 587.6-nm component (possibly from a He-enhanced circumstellar medium), as well as a relatively blue continuum. NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2011 CBAT 2011 May 4 (CBET 2712) Daniel W. E. Green