2007CBET.1109....1B

Further to CBETs 611 and 1104, B. Bassett, South African Astronomical Observatory and University of Cape Town (UCT); A. Becker, University of Washington (UW); D. Bizyaev and H. Brewington, Apache Point Observatory (APO); C. Choi, Seoul National University (SNU); D. Cinabro, Wayne State University (WSU); C. D'Andrea, University of Pennsylvania (Penn); J. Dembicky, APO; D. L. DePoy, Ohio State University (OSU); B. Dilday, University of Chicago (UC); M. Doi, University of Tokyo (UoT); J. Eastman, OSU; J. Frieman, Fermilab and UC; P. Garnavich, University of Notre Dame; A. Goobar, Stockholm University; C. Hogan, UW; J. Holtzman, New Mexico State University; M. Im, SNU; S. Jha, Rutgers University; R. Kessler, UC; B. Ketzeback, APO; K. Konishi, UoT; J. Krzesinski, APO; H. Lampeitl, University of Portsmouth (UP); G. Leloudas, Dark Cosmology Centre (DCC), University of Copenhagen; D. Long, O. Malanushenko, and V. Malanushenko, APO; J. Marriner, Fermilab; R. McMillan, APO; G. Miknaitis, Fermilab; T. Morokuma, National Astronomical Observatory of Japan; J. Mosher, Penn; R. Nichol, UP; D. Oravetz and K. Pan, APO; L. Ostman, Stockholm University; J. L. Prieto, OSU; M. Richmond, Rochester Institute of Technology; A. Riess, Space Telescope Science Institute; R. Romani, Stanford University (SU); M. Sako, Penn; D. Schneider, Pennsylvania State University; A. Simmons, APO; M. Smith, UP; S. Snedden, APO; J. Sollerman and M. Stritzinger, DCC; N. Takanashi and K. Tokita, UoT; M. F. Taylor, WSU; K. van der Heyden, UCT; S. Watters, APO; N. Yasuda, UoT; C. Wheeler, University of Texas; and C. Zheng, SU, on behalf of the Sloan Digital Sky Survey II collaboration, report the discovery of ten supernovae on g, r, and i images taken with the SDSS 2.5-m telescope at APO by the SDSS observing team. J. Marriner, D. McGinnis (Fermilab), G. Miknaitis, A. Becker, J. Frieman, J. Holtzman, and A. Riess also report confirming spectroscopy for 2007nt, obtained with the ARC 3.5-m telescope on Oct. 18 UT. M. Sako, C. D'Andrea, and N. Yasuda report confirming spectroscopy for 2007nr, 2007nv, 2007nw, 2007nx, 2007ny, and 2007oa that was obtained on the Subaru 8-m telescope on Oct. 19; they add that a Subaru spectrum of 2007lx obtained on the same night shows it to be a type-II supernova (this object was previously reported on CBET 1102 as a possible type-II event). R. Romani, C. Zheng, M. Sako, C. Wheeler, D. Schneider, and R. Bender, together with U. Hopp (University of Munich) and W. Kollatschny (University of Goettingen), report confirming spectroscopy that was obtained at the Hobby-Eberly Telescope on Oct. 19 and 20 for 2007ns, 2007nu, and 2007nz. The discovery magnitudes tabulated below are all g magnitudes; spectroscopic redshifts are given in the column labelled z. Peak dates (all 2007) are approximate estimates either from fits to the early light curves or from the spectra, with a typical uncertainty of plus-or-minus several days; in cases where such estimates are either uncertain or very discrepant, they are not reported. Spectroscopic types marked with a question mark (?) imply that the type identification based on the spectrum is uncertain. SN Discov. R.A. (2000.0) Decl. Mag. z Estimated Type Date UT Peak Date 2007nr Sep. 15 1 01 59.47 + 0 40 55.0 21.5 0.14 Sep. 20 II-P 2007ns Sep. 22 2 37 02.97 - 0 51 59.8 22.5 0.37 Oct. 2 Ia 2007nt Oct. 3 3 06 43.80 - 0 45 14.5 22.1 0.21 Oct. 13 Ia 2007nu Oct. 3 3 11 50.18 - 0 41 32.7 21.8 0.28 Oct. 12 Ia 2007nv Oct. 6 0 05 30.34 - 1 12 16.4 21.5 0.14 Oct. 5 II-P 2007nw Oct. 6 20 47 11.37 - 1 15 26.0 20.5 0.06 Oct. 1 II-P 2007nx Oct. 8 0 03 48.36 + 0 21 31.4 20.6 – Oct. 5 IIn 2007ny Oct. 8 1 40 55.52 + 0 13 07.8 21.4 0.14 Oct. 12 II-P 2007nz Oct. 8 3 25 11.35 - 0 06 22.5 22.8 0.47 Oct. 12 Ia? 2007oa Oct. 9 22 13 51.35 - 0 55 13.0 21.8 – Oct. 8 Ia