2007CBET.1098....1B

Further to CBETs 611 and 1081, B. Bassett, South African Astronomical Observatory; 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; C. Gall, Dark Cosmology Centre (DCC), University of Copenhagen; 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; K. Konishi, UoT; J. Krzesinski, APO; H. Lampeitl, University of Portsmouth (UP); R. Kessler, UC; B. Ketzeback, 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, University of Cape Town; 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 nineteen supernovae on g, r, and i images taken with the SDSS 2.5-m telescope at APO by the SDSS observing team. R. Romani, C. Zheng, M. Sako, C. Wheeler, D. Schneider, R. Bender, U. Hopp (University of Munich), and W. Kollatschny (University of Goettingen) add that confirming spectroscopy was obtained at the Hobby- Eberly Telescope on the nights of Sept. 23 (2007km) and Oct. 5 (2007kn, 2007kp, and 2007ku). R. Assef, M. Peeples, and J. Prieto (OSU) obtained confirming spectroscopy of 2007ks at the Hiltner 2.4-m telescope on the night of Sept. 28. A. Goobar, R. Nichol, and M. Molla, Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas, Madrid); F. Castander, Institut de Ciencies de l'Espai, Barcelona; and R. Miquel, Institut de Fisica d'Altes Energies, Barcelona), report that confirming spectroscopy was taken by Castander and Miquel at the 3.58-m Telescopio Nazionale Galileo on La Palma on the nights of Oct. 6-7 for 2007lb, 2007kt, 2007kw, 2007kz, and 2007ky. J. Marriner, D. McGinnis (Fermilab), and G. Miknaitis report that confirming spectroscopy of 2007la and 2007lc was taken on the nights of Oct. 4 and 7, respectively. S. Jha, Rutgers University; and P. Challis, G. Narayan, and R. Kirshner, Harvard University, report that confirming spectroscopy was taken with the Magellan Clay 6.5-m telescope (+ LDSS3) on the nights of Oct. 6-8 for 2007kx, 2007ld, 2007kl, 2007kr, 2007ko, 2007kq, 2007kv, and 2007ku. 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. Types marked with a question mark (?) imply that the type identification based on the spectrum is uncertain.