Electronic Telegram No. 2909 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 2011hz = PSN J08523424+5515142 Denis V. Denisenko, Space Research Institute, Moscow, reports his discovery of a possible supernova (mag 18.2) on four unfiltered CCD images obtained on Nov. 3.88 UT by V. Gerke and S. Korotkiy remotely with the 40-cm Djigit telescope (+ SBIG STL-11K camera) at the Ka-Dar Observatory's TAU station (Nizhniy Arkhyz, Karachay-Cherkessia). The new object is located at R.A. = 8h52m34s.24, Decl. = +55d15'14".2 (equinox 2000.0; uncertainty 0".1), which is 0".9 west and 0".4 north of the presumed host galaxy (SDSS J085234.35+551513.8; magnitudes u = 21.3, g = 20.6, r = 20.2, i = 19.9, z = 19.8). A comparison of the discovery image and a Palomar Sky Survey red plate is posted at URL http://pics.livejournal.com/bigdenru/pic/000as20q/g35. The variable was designated PSN J08523424+5515142 when it was posted at the Central Bureau's TOCP webpage and is here designated SN 2011hz based on the spectroscopic confirmation reported below. Additional CCD magnitudes for 2011hz (unfiltered unless noted otherwise): Nov. 3.48, 18.5 (Catalina Sky Survey, via A. Drake and S. Korotkiy); 7.94, 18.5 (V. Gerke and S. Korotkiy, 40-cm Djigit discovery telescope, TAU station); 8.418, R = 17.8 (Joseph Brimacombe, Cairns, Australia; position end figures 34s.34, 13".9); 13.096, 18.5 (Federica Luppi and Luca Buzzi, Varese, Italy; position end figures 34s.34, 13".9; reference stars from CMC-14 catalogue). 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 J08523424+5515142 = SN 2011hz, obtained on Nov. 20.03 UT with the 1.82-m Copernico Telescope (+ AFOSC; range 340-790 nm, resolution 2.2 nm), suggests that it is a type-Ia supernova. Cross-correlation with a library of supernova spectra using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) indicates that 2011hz is similar to the type-Ia supernova 1994D at about two week past 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 2909) Daniel W. E. Green