Electronic Telegram No. 688 Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A. IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions) CBAT@CFA.HARVARD.EDU (science) URL http://cfa-www.harvard.edu/iau/cbat.html SUPERNOVAE 2006kg-2006lc Further to CBETs 611 and 680, B. Bassett, South African Astronomical Observatory (SAAO); A. Becker, University of Washington (UW); H. Brewington, Apache Point Observatory (APO); C. Choi, Seoul National University (SNU); D. Cinabro, Wayne State University; F. DeJongh, Fermilab; J. Dembicky, APO; D. L. DePoy, Ohio State University (OSU); B. Dilday, University of Chicago (UC); M. Doi, University of Tokyo (UoT); J. Frieman, Fermilab and UC; P. Garnavich, University of Notre Dame; M. Harvanek, APO; C. Hogan, UW; J. Holtzman, New Mexico State University; M. Im, SNU; S. Jha, Stanford University (SU); K. Konishi, UoT; J. Krzesinski, APO; H. Lampeitl, Space Telescope Science Institute (STScI); R. Kessler, UC; B. Ketzeback, D. Long, O. Malanushenko, and V. Malanushenko, APO; J. Marriner and D. McGinnis, Fermilab; R. McMillan, APO; G. Miknaitis, Fermilab; T. Morokuma, UoT; R. Nichol, University of Portsmouth (UP); K. Pan, APO; J. L. Prieto, OSU; M. Richmond, Rochester Institute of Technology; A. Riess, STScI; R. Romani, SU; M. Sako, University of Pennsylvania; G. Saurage, APO; D. Schneider, Pennsylvania State University; M. Smith, UP; S. Snedden, APO; N. Takanashi and K. Tokita, UoT; K. van der Heyden, SAAO; S. Watters, APO; C. Wheeler, University of Texas; N. Yasuda, UoT; and C. Zheng, SU, on behalf of the Sloan Digital Sky Survey II collaboration, report the discovery of 23 new supernovae on multiple g, r, and i images taken with the SDSS 2.5-m telescope at APO by the SDSS observing team. A. Aragon-Salamanca, University of Nottingham; M. Bremer, University of Bristol; M. Turatto, University of Padova; A. Goobar, University of Stockholm; R. Nichol; J. Sollerman, University of Copenhagen; P. Ruiz-Lapuente and F. Castander, University of Barcelona; A. Romer, University of Sussex; C. Collins, Liverpool John Moores University; and J. Lucey and A. Edge, University of Durham, report that spectroscopy obtained by M. Smith and M. Stritzinger on Oct. 17 and 18 UT with the European Southern Observatory 3.6-m New Technology Telescope shows 2006kq and 2006kt to be type-Ia supernovae, 2006kj to be a possible type-Ia supernova, 2006kh and 2006kn to be type-II supernovae, and 2006kg to be a possible type-II supernova. Romani, Zheng, Sako, Wheeler, and Schneider, together with U. Hopp (University of Munich) and W. Kollatschny (University of Goettingen), report that spectroscopic observations with the Hobby Eberly Telescope on Oct. 18 and 20 show that 2006ki, 2006kk, 2006kl, 2006km, and 2006ks are type-Ia supernovae, while 2006ko and 2006kp are probable or possible type-Ia events. Miknaitis, McGinnis, and Marriner report that spectroscopic observations with the ARC 3.5-m telescope on Oct. 20 and 23 indicate that 2006kr is a type-Ia supernova and 2006kv is a type-II supernova. J. Eastman, J. L. Prieto, L. Watson, R. Assef, K. Schlesinger, and D. DePoy, OSU; and A. Crotts, Columbia University, report that spectroscopic observations with the Hiltner 2.4-m telescope at MDM Observatory on Oct. 22 and 23 indicate that 2006ku, 2006kw, 2006kx, 2006ky, 2006kz, 2006la, and 2006lb are type-Ia supernovae, and that 2006lc is a probable type-Ic supernova. The discovery magnitudes tabulated below are all SDSS g magnitudes. Spectroscopic redshifts are given in the column labelled "z". Peak dates (all 2006) are approximate estimates from early fits to the multi-band light curves or from the spectra. SN Discov. R.A. (2000.0) Decl. Mag. z Estimated Date UT Peak Date 2006kg Sep. 11 1 04 16.98 + 0 46 08.9 20.2 0.23 -- 2006kh Sep. 11 1 49 11.85 - 0 36 18.9 20.6 0.06 -- 2006ki Sep. 20 21 06 34.18 - 0 38 52.6 23.2 0.22 Oct. 2 2006kj Sep. 27 3 24 32.81 + 1 01 20.5 20.9 0.21 Oct. 4 2006kk Sep. 28 0 27 39.86 + 0 38 58.2 22.8 0.39 Oct. 9 2006kl Sep. 28 0 31 33.28 - 0 08 08.9 21.3 0.22 Oct. 3 2006km Sep. 29 2 20 37.93 + 0 20 54.2 22.0 0.30 Oct. 2 2006kn Sep. 30 20 58 05.22 + 0 54 01.7 21.0 0.12 Oct. 6 2006ko Oct. 1 1 28 59.95 + 0 46 11.8 22.3 0.38 Oct. 10 2006kp Oct. 1 2 11 11.66 + 0 41 45.0 23.3 0.29 Oct. 2 2006kq Oct. 2 21 15 36.58 - 0 19 17.1 22.8 0.20 Oct. 11 2006kr Oct. 11 0 19 19.68 + 1 05 26.6 22.2 0.22 Oct. 22 2006ks Oct. 11 22 30 04.66 + 0 00 13.2 22.8 0.21 Oct. 19 2006kt Oct. 12 21 35 50.32 - 1 03 26.8 21.5 0.24 Oct. 21 2006ku Oct. 13 23 38 13.60 + 1 14 56.8 22.5 0.19 Oct. 25 2006kv Oct. 16 0 03 06.66 + 0 54 49.6 19.5 -- -- 2006kw Oct. 16 2 14 57.98 + 0 36 09.0 21.2 0.19 Oct. 27 2006kx Oct. 16 3 42 14.67 + 0 28 41.8 21.1 0.16 Oct. 29 2006ky Oct. 17 21 18 40.40 - 1 01 27.4 21.5 0.18 Oct. 28 2006kz Oct. 17 21 47 23.40 - 0 29 40.8 21.4 0.18 Oct. 29 2006la Oct. 17 22 42 48.34 - 0 54 06.3 21.2 0.12 Oct. 28 2006lb Oct. 20 3 19 28.19 - 0 19 04.9 20.9 0.18 Oct. 25 2006lc Oct. 21 22 44 24.48 - 0 09 53.5 20.2 0.02 Nov. 1 NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2006 CBAT 2006 October 24 (CBET 688) Daniel W. E. Green