Electronic Telegram No. 1061 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 2007ih-2007ik Further to CBETs 611 and 1057, 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; 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; 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; D. Oravetz and 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; A. Simmons, APO; 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 four type-Ia supernovae on g, r, and i images taken with the SDSS 2.5-m telescope at APO by the SDSS observing team. Spectroscopy was obtained by D. Atlee, J. Eastman, and J. Prieto (OSU) with the Hiltner 2.4-m telescope at MDM Observatory on the night of Sept. 10; 2007ii is a probable type-Ia supernova. The discovery magnitudes tabulated below are all g magnitudes; spectroscopic redshifts are given in the column labelled z. Peak dates in 2007 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 Date UT Peak Date 2007ih Sept. 3 21 33 10.77 - 0 57 36.5 20.8 0.17 Sep. 10 2007ii Sept. 4 0 33 34.05 + 0 59 05.7 21.0 0.27 Sept. 3 2007ij Sept. 4 23 57 21.96 + 0 06 21.1 20.6 0.18 Sep. 11 2007ik Sept. 5 22 38 53.72 - 1 10 01.5 20.9 0.18 Sep. 12 NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2007 CBAT 2007 September 12 (CBET 1061) Daniel W. E. Green