Electronic Telegram No. 623 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 2006fa AND 2006fd-2006fn Further to CBET 611, 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 (UT); 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, UT; 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, Fermilab; R. McMillan, APO; G. Miknaitis, Fermilab; T. Morokuma, UT; 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; D. Schneider, Pennsylvania State University; M. Smith, UP; S. Snedden, APO; N. Takanashi and K. Tokita, UT; K. van der Heyden, SAAO; S. Watters, APO; N. Yasuda, UT; and C. Zheng, SU, on behalf of the Sloan Digital Sky Survey II collaboration, report the discovery of eleven supernovae on multiple g, r, and i images taken with the SDSS 2.5-m telescope at Apache Point Observatory by the SDSS observing team. B. Bassett, K. van der Heyden, and P. Vaisanen, SAAO, report that a spectrum of 2006ff taken with the South African Large Telescope on Sept. 15 UT shows it to be a type-Ia event. A. Aragon-Salamanca, University of Nottingham; M. Bremer, University of Bristol; M. Turatto, University of Padova; A. Goobar, University of Stockholm; 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 R. Nichol and M. Smith on Sept. 15 and 16 with the European Southern Observatory 3.6-m New Technology Telescope (NTT) shows eight of the other new supernovae to be type-Ia events, while SN 2006fg is a type-II event, and the type of SN 2006fe is not yet determined. N. Yasuda reports that three of the objects -- 2006fk, 2006fm, and 2006fi -- were confirmed as type-Ia events on the same nights as the NTT observations via the Subaru 8-m telescope. The discovery magnitudes tabulated below are all g magnitudes, and the 2006 discovery dates are UT. Spectroscopic redshifts are given in the column labelled z. Esimated peak g magnitudes and corresponding dates (all 2006) are estimates from early fits to the multi-band light curves. SN Discov. R.A. (2000.0) Decl. Mag. z Estimated Peak Date Date Mag. 2006fd Aug. 27 20 37 53.25 +01 13 16.1 19.4 0.08 Aug. 17 19.0 2006fe Aug. 27 20 52 09.16 -00 30 40.0 21.0 0.07 Sept. 1 20 2006ff Aug. 28 00 26 35.64 -00 18 07.5 20.7 0.24 Aug. 26 20.7 2006fg Aug. 28 00 38 20.04 -00 17 41.9 19.1 0.03 Aug. 29 18.5 2006fh Aug. 28 01 49 34.91 -00 38 59.6 20.4 0.13 Aug. 20 19.8 2006fi Aug. 28 22 19 50.26 +00 01 27.8 22.1 0.23 Sept. 9 21.1 2006fj Sept.11 02 47 08.67 +00 46 30.5 20.3 0.19 Sept.12 20.3 2006fk Sept.11 22 01 01.33 +00 42 58.5 21.3 0.16 Sept.13 21.2 2006fl Sept.11 22 11 27.71 +00 45 21.5 20.3 0.17 Sept.10 20.3 2006fm Sept.15 22 10 10.26 +00 30 11.8 20.2 0.13 Sept.12 20.2 2006fn Sept.15 23 00 05.98 +00 32 15.6 20.6 0.18 Sept.12 20.6 Also, an additional spectrum of SN 2006fa, listed as a possible type-Ia event on CBET 621, was taken by R. Nichol and M. Smith with the NTT, confirming it as a type-Ia supernova with a redshift of 0.16. NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2006 CBAT 2006 September 17 (CBET 623) Daniel W. E. Green