Electronic Telegram No. 2972 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 2011jx = PSN J10290876+4604576 A. J. Drake, S. G. Djorgovski, M. J. Graham, A. Mahabal, and R. Williams, California Institute of Technology; J. L. Prieto, Princeton University; M. Catelan, Pontificia Universidad Catolica de Chile; 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 unfiltered Catalina Sky Survey (CSS) images: SN 2011 UT R.A. (2000.0) Decl. Mag. Offset 2011jx Dec. 29.40 10 29 08.76 +46 04 57.6 18.0 1" N The variable was designated PSN J10290876+4604576 when it was posted at the Central Bureau's TOCP webpage and is here designated SN 2011jx based on the spectroscopic confirmation reported below. Additional unfiltered CCD magnitudes for 2011jx: 2011 May 6.16 UT, [18.7 (CSS); Dec. 31.227, 17.9 (R. A. Koff, Bennett, CO, USA; Meade 0.25-m f/10 Schmidt-Cassegrain reflector + Apogee AP-47p camera; limiting magnitude 20.0; position end figures 08s.71, 57".3; UCAC3 reference stars); 2012 Jan. 5.000, R = 17.7 +/- 0.1 (K. Sarneczky, Konkoly Observatory, Hungary; 0.60-m Schmidt telescope). J. L. Prieto, Princeton University, reports that optical spectroscopy (range 350-960 nm; resolution 0.7 nm) of 2011jx was obtained with the APO 3.5-m telescope (+ DIS) on Jan. 2 UT, showing it to be a type-Ia supernova. After cross-correlation with a library of supernova spectra using SNID (Blondin and Tonry 2007, Ap.J. 666, 1024), a redshift of 0.085 and a phase of approximately nine days after maximum light was found. NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2012 CBAT 2012 January 8 (CBET 2972) Daniel W. E. Green