BASSETT B., BECKER A., BREWINGTON H., CHOI C., CINABRO D., DEJONGH F., DEMBICKY J., DEPOY D.L., DILDAY B., DOI M., FRIEMAN J., GARNAVICH P., HARVANEK M., HOGAN C., HOLTZMAN J., IM M., JHA S., KONISHI K., KRZESINSKI J., LAMPEITL H., KESSLER R., KETZEBACK B., LONG D., MALANUSHENKO O., MARRINER J., McMILLAN R., MIKNAITIS G., MOROKUMA T., NICHOL R., PAN K., PRIETO J.L., RICHMOND M., RIESS A., ROMANI R., SAKO M., SCHNEIDER D., SMITH M., SNEDDEN S., TAKANASHI N., TOKITA K., VAN DER HEYDEN K., WATTERS S., WHEELER C., YASUDA N., ZHENG C., HOPP U., KOLLATSCHNY W., IHARA Y. and VAISANEN P.
Abstract (from CDS):
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 (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, 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; 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 reports the discovery of seven 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. 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 Sept. 18 and 19 UT show that five of the new objects (2006gk, 2006gl, 2006gm, 2006go, and 2006gp) are type-Ia supernovae. Spectroscopic observations with the Subaru 8-m telescope on Sept. 18 by M. Doi, N. Takanashi, Y. Ihara, T. Morokuma, K. Tokita, K. Konishi, and N. Yasuda indicate that 2006gq is a probable type-II supernova. B. Bassett, K. van der Heyden, and P. Vaisanen, SAAO, report that a spectrum of 2006gn, taken with the South African Large Telescope on Sept. 18, shows it to be a type-Ia supernova. The discovery and peak magnitudes tabulated below are all SDSS g magnitudes, with the exception of 2006go (r magnitude), and discovery dates are UT. Spectroscopic redshifts are given in the column labelled "z". Peak magnitudes and 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 UT Date Mag. 2006gk Aug. 27 21 25 23.34 - 1 02 01.2 21.8 0.29 Aug. 20 21.6 2006gl Aug. 28 1 05 50.11 + 0 08 41.3 21.6 0.27 Aug. 23 21.4 2006gm Aug. 28 22 59 07.46 - 0 37 38.5 21.5 0.25 Aug. 17 21.3 2006gn Aug. 28 23 11 18.43 + 0 30 16.6 20.2 0.10 Sept. 8 19.1 2006go Sept.12 0 24 33.76 - 0 16 44.7 22.0r 0.37 Sept.18 22 r 2006gp Sept.15 22 34 10.00 + 0 03 17.9 22.2 0.21 Sept. 7 21.8 2006gq Sept.17 1 45 12.54 + 0 21 23.2 20.2 0.07 – –
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