Electronic Telegram No. 1057 Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A. IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions) CBAT@CFA.HARVARD.EDU (science) URL http://www.cfa.harvard.edu/iau/cbat.html SUPERNOVAE 2007hw-2007ie Further to CBETs 611 and 786, B. Bassett, South African Astronomical Observatory; A. Becker, University of Washington (UW); H. Brewington, Apache Point Observatory (APO); C. Choi, Seoul National University (SNU); D. Cinabro, Wayne State University; 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 (UT); J. Eastman, OSU; 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, Rutgers University; K. Konishi, UT; 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; K. Pan, APO; 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; M. Smith, UP; S. Snedden, APO; N. Takanashi and K. Tokita, UT; K. van der Heyden, University of Cape Town; S. Watters, APO; N. Yasuda, UT; C. Wheeler, University of Texas; and C. Zheng, SU, on behalf of the Sloan Digital Sky Survey (SDSS) II collaboration, report the discovery of nine supernovae on g, r, and i images taken with the SDSS 2.5-m telescope at APO by the SDSS observing team. D. Atlee, J. Eastman, and J. Prieto (OSU) report that spectroscopy obtained with the Hiltner 2.4-m telescope at MDM Observatory on the nights of Sept. 8 and 9 shows six of the new objects to be type-Ia supernovae, one to be a probable type-Ia supernova, and two to be type-II supernovae. The discovery magnitudes tabulated below are all g magnitudes. Spectroscopic redshifts are given in the column labelled z. Peak dates are approximate estimates from the spectra, with a typical uncertainty of +/- 2 to 3 days. SN Discov. R.A. (2000.0) Decl. Mag. z Estimated Type Date UT Peak Date 2007hw Sept. 3 2 03 35.16 + 0 47 10.3 20.4 0.08 Sept. 6 II 2007hx Sept. 3 2 06 27.08 - 0 53 58.3 19.5 0.08 Sept. 8 Ia 2007hy Sept. 3 3 39 42.33 + 1 05 32.2 20.9 0.19 Sept. 3 Ia 2007hz Sept. 3 21 03 08.95 - 1 01 45.1 19.7 0.14 Sept. 8 Ia 2007ia Sept. 4 3 43 10.06 + 0 06 08.9 20.0 0.13 Sept. 5 Ia 2007ib Sept. 4 23 15 44.56 + 0 27 25.6 20.4 0.03 Sep. 11 II 2007ic Sept. 5 0 05 57.98 + 1 06 11.1 20.0 0.14 Aug. 29 Ia 2007id Sept. 5 21 46 00.49 - 1 13 03.9 20.2 0.16 Aug. 29 Ia 2007ie Sept. 5 22 17 36.69 + 0 36 48.0 20.1 0.10 Aug. 27 Ia? NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2007 CBAT 2007 September 10 (CBET 1057) Daniel W. E. Green