2007CBET.1104....1B

Further to CBETs 611 and 1102, 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; 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, 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 twenty-one supernovae on g, r, and i images taken with the SDSS 2.5-m telescope at APO by the SDSS observing team. A. V. Filippenko, J. M. Silverman, R. J. Foley, and M. Modjaz, University of California, Berkeley, have reported confirming spectroscopy of 2007my, obtained on the Keck 10-m telescope on Oct. 16 UT. A. Aragon-Salamanca, University of Nottingham; M. Bremer, University of Bristol; M. Turatto, University of Padova; A. Goobar; R. Nichol; J. Sollerman; P. Ruiz-Lapuente, University of Barcelona; F. Castander, University of Barcelona; A. K. Romer, University of Sussex, C. Collins, Liverpool John Moores University; and J. Lucey and A. Edge, University of Durham, have reported confirming spectroscopy that was obtained at the European Southern Observatory's New Technology Telescope on Oct. 16 and 17 by M. Smith and G. Leloudas for 2007ms, 2007mr, 2007mz, 2007nl, 2007nb, 2007nc, 2007mv, 2007ne, 2007nf, 2007ni, 2007nj, and 2007nk. R. Romani, C. Zheng, M. Sako, C. Wheeler, and D. Schneider, together with R. Bender and U. Hopp, University of Munich; and W. Kollatschny, University of Goettingen, have reported confirming spectroscopy obtained at the Hobby-Eberly Telescope on Oct. 15 and 17 for 2007mt, 2007mw, 2007mu, 2007nd, 2007ng, 2007nh, 2007mx, and 2007na. 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 question marks (?) 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 2007mr Sep. 5 20 08 18.00 - 0 39 44.7 21.3 0.08 Sep. 1 II 2007ms Sep. 13 20 32 18.34 - 1 00 53.1 20.7 0.04 Sep. 17 II-pec 2007mt Sep. 19 1 45 56.59 - 0 13 03.5 23.1 0.41 Oct. 1 Ia? 2007mu Sep. 22 0 12 18.56 - 0 04 38.3 22.0 0.40 Sep. 21 Ia 2007mv Sep. 22 0 35 37.37 + 0 22 12.1 22.3 0.26 Oct. 5 Ia 2007mw Oct. 3 23 03 02.76 + 0 50 57.0 22.4 0.33 Oct. 3 Ia 2007mx Oct. 6 21 14 10.87 - 0 17 46.5 22.7 0.41 Oct. 8 Ia 2007my Oct. 6 21 55 32.20 - 0 22 19.2 21.8 0.29 Oct. 12 Ia 2007mz Oct. 6 22 07 51.20 - 1 04 11.8 22.2 0.23 Oct. 16 Ia 2007na Oct. 6 22 13 32.79 + 0 52 49.8 22.8 0.47 Oct. 11 Ia 2007nb Oct. 6 23 25 30.06 + 0 25 23.1 22.1 0.28 Oct. 18 Ia 2007nc Oct. 8 0 01 09.30 + 1 04 06.5 22.5 0.09 Oct. 20 Ib? 2007nd Oct. 8 0 40 18.81 - 1 02 14.5 21.8 0.27 Oct. 7 Ia 2007ne Oct. 8 0 54 02.20 + 1 04 08.4 22.2 0.21 Oct. 25 Ia 2007nf Oct. 8 1 03 26.47 + 0 19 53.0 22.8 0.24 Oct. 20 Ia 2007ng Oct. 8 2 25 38.10 + 0 42 34.5 23.2 0.40 Oct. 15 Ia 2007nh Oct. 8 2 50 27.69 - 0 33 04.2 21.8 0.27 Oct. 16 Ia 2007ni Oct. 9 2 05 50.39 - 0 19 54.7 21.8 0.21 Oct. 23 Ia 2007nj Oct. 11 2 52 27.45 + 0 15 06.6 21.9 0.15 Oct. 18 Ia 2007nk Oct. 13 3 20 56.52 + 1 03 29.3 21.5 0.22 Oct. 19 Ia 2007nl Oct. 13 23 13 44.92 - 0 04 03.5 21.8 0.16 Oct. 11 II Also, J. Marriner and D. McGinnis (Fermilab), G. Miknaitis, A. Becker, J. Frieman, J. Holtzman, and A. Riess report that a spectrum taken with the ARC 3.5-m telescope on Oct. 16 shows that 2007md, originally reported on CBET 1102 as a type-Ic supernova, is in fact a type-II supernova.