Electronic Telegram No. 2713 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 2011cd IN MCG -02-52-11 = PSN J20321290-0843470 G. Pignata and M. Cifuentes, Universidad Andres Bello; J. Maza, M. Hamuy, R. Antezana, L. Gonzalez, R. Cartier, F. Forster, S. Silva, F. Carrasco, P. Sanchez, C. Hervias, and D. Iturra, Universidad de Chile; C. Farias, Pontificia Universidad Catolica de Chile; B. Conuel, Wesleyan University; G. Folatelli, IPMU, University of Tokyo; and D. Reichart, K. Ivarsen, J. Haislip, A. Crain, D. Foster, M. Nysewander, and A. LaCluyze, University of North Carolina at Chapel Hill, on behalf of the CHASE project (which is part of the Millennium Center for Supernova Science collaboration), report the discovery of an apparent supernova (mag approximately 17.7 +/- 0.4) on an unfiltered image taken on Apr. 14.34 UT with the 0.41-m 'PROMPT 3' telescope located at Cerro Tololo. The new object (which was designated PSN J20321290-0843470 when posted at the Central Bureau's TOCP webpage and is here designated SN 2011cd based on the spectroscopic report below) is located at R.A. = 20h32m12s.96 +/- 0".2, Decl. = -8d43'47".1 +/- 0".2 (equinox 2000.0), which is about 2".7 east and 14".3 north of center of the galaxy MCG -02-52-11 (= PGC 64907). Additional CCD magnitudes for 2011cd (unfiltered unless otherwise noted): 2009 Sept. 25.03, [18.5 (CHASE/PROMPT); 2010 Mar. 28.38, [18.5 (CHASE/PROMPT); 2011 Apr. 16.36, 17.4 (CHASE/PROMPT); 20.470, 18.9 (Joseph Brimacombe, Cairns, Australia; remotely using a 51-cm RCOS telescope + STL11K camera at the New Mexico Skies Observatory near Mayhill, NM, U.S.A.; position end figures 12s.96, 46".3); 22.779, 18.7 (Brimacombe; red filter; position end figures 12s.95, 46".9). Brimacombe's Apr. 20 image is posted at website URL http://www.flickr.com/photos/43846774@N02/5639435949/; his Apr. 22 image is posted at http://www.flickr.com/photos/43846774@N02/5645086959/. M. Stritzinger, A. Jerkstrand, J. Sollerman, M. Ergon; Oskar Klein Centre, Stockholm University; and R. J. Foley; Harvard-Smithsonian Center for Astrophysics, on the behalf of the Millenium Center for Supernova Studies (Universidad de Chile), report that they obtained a spectrogram on Apr. 28.2 UT of 2011cd with the Gemini-South telescope (+ GMOS). The spectrum contains a rich number of emission lines including, among others: numerous Fe II lines between 400 and 550 nm; Mg I] at 451 nm; Na I D, possibly blended with He I 588-nm; [O I] at 558 and 630/636 nm; H_alpha; Fe II at 715 nm; [Ca I] at 730 nm; O I at 777 nm; a prevalent emission feature due to the Ca II near-infrared triplet; and a tentative identification of He I at 707 nm. All emission features except the Ca lines show strong blueshifts, with H_alpha showing the most pronounced blueshift of approximately 3500 km/s. The spectrum is consistent with that of a type-II supernova at late phases. NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2011 CBAT 2011 May 5 (CBET 2713) Daniel W. E. Green