2007CBET.1128....1B

Further to CBETs 611 and 1117, 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 (DARK), 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, DARK; 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 twenty 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 report confirming spectroscopy of 2007or, 2007ou, and 2007pg that was obtained with the ARC 3.5-m telescope on Nov. 4 UT. 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 with the Hobby-Eberly Telescope on Nov. 4 and 5 for 2007oq, 2007os, 2007ov, 2007ow, 2007ox, 2007oy, 2007oz, 2007pe, 2007pi, and 2007pj. A. Goobar, R. Nichol, 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 = IFAE, Barcelona), report confirming spectroscopy that was taken by Miquel, Molla, and L. Galbany (IFAE) at the 3.58-m Telescopio Nazionale Galileo on La Palma on the nights of Nov. 4 and 5 for 2007ot, 2007pa, 2007pb, 2007pc, 2007pd, 2007pf, and 2007ph. 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. SN Discov. R.A. (2000.0) Decl. Mag. z Estimated Type Date UT Peak Date 2007oq Oct. 6 21 42 30.75 + 0 59 04.6 22.0 0.34 Oct. 10 Ia? 2007or Oct. 9 1 42 38.33 + 1 01 49.5 21.9 0.17 Oct. 21 Ia 2007os Oct. 11 1 57 38.65 - 0 31 19.7 22.6 0.35 Oct. 11 Ia? 2007ot Oct. 12 0 35 36.76 - 0 13 57.7 23.0 0.20 Oct. 27 Ia 2007ou Oct. 12 2 23 42.69 - 0 49 33.6 22.5 0.11 Oct. 28 Ia 2007ov Oct. 12 2 41 08.76 + 0 08 40.0 22.3 0.32 Oct. 19 Ia 2007ow Oct. 12 21 34 02.09 - 0 44 25.9 22.2 0.21 Oct. 18 Ia? 2007ox Oct. 13 22 46 58.08 - 0 04 18.5 21.7 0.21 Oct. 22 Ia? 2007oy Oct. 15 23 17 55.44 + 1 13 22.2 22.7 0.38 Oct. 22 Ia 2007oz Oct. 15 23 57 16.57 + 0 14 57.7 23.0 0.30 Oct. 20 Ia 2007pa Oct. 19 21 01 34.45 - 0 16 06.6 21.5 0.16 Nov. 3 Ia 2007pb Oct. 19 23 48 25.00 - 1 11 06.0 22.0 0.24 Oct. 30 Ia 2007pc Oct. 20 21 15 49.46 + 0 39 04.7 21.4 0.15 Nov. 1 Ia 2007pd Oct. 20 23 11 54.07 - 0 34 41.1 22.1 0.15 Nov. 3 Ia 2007pe Oct. 21 2 21 04.01 + 0 29 47.1 21.8 0.30 Oct. 22 Ia 2007pf Oct. 29 22 11 43.32 + 0 34 44.6 20.2 0.12 Nov. 11 Ia 2007pg Oct. 29 23 27 49.61 + 0 27 26.9 19.6 0.12 Oct. 29 II? 2007ph Oct. 30 20 51 13.40 - 0 57 20.9 21.5 0.14 Nov. 8 Ia 2007pi Oct. 30 22 46 49.33 + 0 45 22.7 22.2 0.29 Nov. 6 Ia 2007pj Oct. 31 23 49 10.70 + 0 47 52.4 22.3 0.35 Nov. 5 Ia