Electronic Telegram No. 2845 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 2011gk IN UGC 1523 = PSN J02021902+1939396 B. Moore, A. Sehgal, and T. Puckett report the discovery of an apparent supernova (mag 18.0) on an unfiltered CCD image (limiting mag 19.9) taken with a 0.50-m reflector at Osoyoos, British Columbia, on Sept. 6.4795 UT in the course of the Puckett Observatory Supernova Search. The new object, which was confirmed at mag 18.0 on Sept. 7.439 by Sehgal at Osoyoos, is located at R.A. = 2h02m19s.02, Decl. = +19o39'39".6 (equinox 2000.0), which is 2".8 west and 8".5 north of the center of UGC 1523. Nothing is visible at this position on images taken by Puckett on 2010 Oct. 17 (limiting mag 19.8). Puckett has posted an image at website URL http://possdata.com/PSNJ02021902+1939396.jpg. The variable was designated PSN J02021902+1939396 when it was posted on the Central Bureau's TOCP webpage and is here designated SN 2011gk based on the spectroscopic confirmation reported below. Joseph Brimacombe, Cairns, Australia, reports mag 19.1 and position end figures 19s.01, 38".9 from stacked CCD images taken on Sept. 8.651 with an infrared filter; his image is posted at website URL http://www.flickr.com/photos/43846774@N02/6127931491/. G. H. Marion, Harvard-Smithsonian Center for Astrophysics (CfA), on behalf of the CfA Supernova Group, reports that a spectrum (range 340-740 nm) of PSN J02021902+1939396 = SN 2011gk was obtained on Sept. 29 UT by Marion with the F. L. Whipple Observatory 1.5-m telescope (+ FAST). Cross-correlation with a library of supernova spectra using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) shows that 2011gk is a type-Ia supernova about one month after maximum light. The best-fit SNID template is to SN 2004L at +28 days and z = 0.043. S. Valenti, F. Bufano, 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 J02021902+1939396 = SN 2011gk, obtained by the Service Telescope Operator Team on Sept. 29.89 UT with the Ekar-Copernico 1.82-m telescope (+ AFOSC), is that of a type-Ia 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), suggest a normal type-Ia supernova about one month after the B-band maximum at a redshift of z = 0.044 (Giovanelli and Haynes 1993, A.J. 105, 1271; via the NED website). NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2011 CBAT 2011 October 1 (CBET 2845) Daniel W. E. Green