Electronic Telegram No. 2842 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 2011gi IN PGC 1981 = PSN J00324300+2606516 S. Howerton, Arkansas City, KS, U.S.A.; A. J. Drake, S. G. Djorgovski, A. Mahabal, M. J. Graham, and R. Williams, California Institute of Technology; J. L. Prieto, Princeton University; M. Catelan, Pontificia Universidad Catolica de Chile; R. H. McNaught and G. Garradd, Australian National University; E. C. Beshore and S. M. Larson, Lunar and Planetary Laboratory, University of Arizona; and E. Christensen, Gemini Observatory, report the discovery of an apparent supernova in public images from the Catalina Sky Survey (CSS). SN 2011 UT R.A. (2000.0) Decl. Mag. Offset 2011gi Sep. 21.27 0 32 43.00 +26 06 51.6 18.2 13".8 W, 13".6 S This variable was designated PSN J00324300+2606516 when it was posted on the Central Bureau's TOCP webpage and is here designated 2011gi based on the spectroscopic confirmation reported below. Additional unfiltered CCD magnitudes for 2011gi: June 10.44 UT, [19.5 (CSS); Sept. 23.151, 18.5 (Joseph Brimacombe, Cairns, Australia; position end figures 43s.00, 51".2; image posted at URL http://www.flickr.com/photos/43846774@N02/6177438626/); 23.246, 17.9 (R. A. Koff, Bennett, CO, USA; Meade 0.25-m f/10 Schmidt-Cassegrain reflector + Apogee AP-47p CCD camera; thirty stacked 60-s images; limiting mag 20.5; image scale 2"/pixel; position end figures 42s.97, 51".2, UCAC3 reference stars). G. H. Marion, Harvard-Smithsonian Center for Astrophysics (CfA), on behalf of the CfA Supernova Group, report that a spectrum (range 340-740 nm) of PSN J00324300+2606516 = 2011gi was obtained on Sept. 27 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 2011gi is a type-Ia supernova about 40 days after maximum light. The best-fit SNID templates are for 1991T-like type-Ia supernovae between 37 and 45 days post-maximum at z = 0.034. NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2011 CBAT 2011 September 29 (CBET 2842) Daniel W. E. Green