Electronic Telegram No. 2551 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 SUPERNOVAE 2010jx, 2010jy, 2010jz, 2010ka, 2010kb A. J. Drake, S. G. Djorgovski, A. Mahabal, M. J. Graham, and R. Williams, California Institute of Technology; T. A. Fatkhullin, V. N. Komarova, A. S. Moskvitin, V. V. Sokolov, and T. N. Sokolova, Special Astrophysical Observatory (SAO), Russian Academy of Sciences; J. L. Prieto, Carnegie Observatories; 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 five supernovae in unfiltered Catalina Sky Survey (CSS) images: SN 2010 UT R.A. (2000.0) Decl. Mag. Offset 2010jx Oct. 28.19 1 19 42.22 +30 24 49.2 19.2 0".9 W, 0".7 N 2010jy Oct. 30.15 23 09 43.58 + 5 41 56.2 16.5 6".6 E, 1".6 S 2010jz Nov. 2.40 7 17 15.74 +45 23 03.7 18.0 4".5 W, 1".5 N 2010ka Nov. 7.35 3 26 01.99 - 0 49 48.0 19.4 0".6 W, 1".6 N 2010kb Nov. 10.43 8 20 47.41 +35 53 37.5 18.1 0".9 W, 0".7 N Further CSS magnitudes of 2010jx: Oct. 9.30 UT, [20.3; 17.30, 19.0; Nov. 11.27, 19.9. Further CSS magnitudes of 2010jy: Sept. 10.37, [19.8; 30.28, 17.2; Nov. 12.24, 16.9. Further CSS magnitudes of 2010jz: Oct. 10.41, [20.1; Nov. 11.36, 17.9. Further CSS magnitudes of 2010ka: Oct. 30.40, [20.2; Nov. 16.30, 19.3. Further CSS magnitudes of 2010kb: Oct. 17.46, [19.2; Oct. 31.50, 18.8. The supernovae were spectroscopically confirmed with SAO's BTA 6-m reflector (+ SCORPIO; range 380-790 nm) on Nov. 9 and 10. SN 2010kb exhibits a steep blue continuum and narrow Balmer emission lines characteristic of a type-IIn supernova at redshift z = 0.075. Cross- correlation of the remaining objects with a library of supernova spectra using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) indicates the following best matches: 2010jx is a type-Ia supernova, similar to SN 1995al at two weeks past maximum with redshift z = 0.11; 2010jy is a type-IIn supernova, similar to SN 1998S at two weeks past maximum with redshift z = 0.042; 2010jz is a type-Ia supernova, similar to 1995D just past maximum at redshift z = 0.066; and 2010ka is a type-Ia supernova, similar to 2003du just past maximum at redshift z = 0.166. NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2010 CBAT 2010 November 17 (CBET 2551) Daniel W. E. Green