Electronic Telegram No. 2908 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 2011hy IN UGC 3131 = PSN J04450526+7247025 Giancarlo Cortini, Predappio, Italy, reports his discovery of an apparent supernova (mag 17.3) on several CCD images (limiting mag 19.0) taken with a Celestron 14 telescope on Nov. 16.78 UT. The new object is located at R.A. = 4h45m05s.26, Decl. = +72d47'02".6 (equinox 2000.0), which is 4" west and 1" south of the center of UGC 3131; he notes that nothing is visible at this position on Palomar Sky Survey red or blue plates (no limiting magnitudes or dates provided) or on his earlier images to limiting mag 19.0 (no dates provided). The variable was designated PSN J04450526+7247025 when it was posted at the Central Bureau's TOCP webpage and is here designated SN 2011hy based on the spectroscopic confirmation reported below. Additional unfiltered CCD magnitudes for 2011hy: Nov. 16.959, 17.9 (Federica Luppi and Luca Buzzi, Varese, Italy; 0.38-m f/6.8 reflector; position end figures 05s.08, 01".7; reference stars from the NOMAD catalogue; image posted at website URL http://www.astrogeo.va.it/pub/TOCP/PSN_U3131.jpg); 17.735, 16.5 (Nick James, Chelmsford, Essex, England; Celestron 11 telescope + ST9-XE camera; position end figures 05s.14, 01".4; UCAC-3 reference stars). 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 spectrogram of PSN J04450526+7247025 = SN 2011hy, obtained on Nov. 19.93 UT with the 1.82-m Copernico Telescope (+ AFOSC; range 340-790 nm, resolution 2.2 nm), shows that it 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 website URL https://gelato.tng.iac.es/login.cgi) suggests that 2011hy is similar to SN 2006bp (Quimby et et al. 2011, MNRAS 417, 261) at about one week 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 NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars.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 22 (CBET 2908) Daniel W. E. Green