[IAUC] CBET 657: 20061003 : SUPERNOVAE 2006hy, 2006hz, 2006ia, 2006ib

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                                                  Electronic Telegram No. 657
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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CBAT en CFA.HARVARD.EDU (science)
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SUPERNOVAE 2006hy, 2006hz, 2006ia, 2006ib
     Further to CBETs 611 and 656, B. Bassett, South African Astronomical
Observatory (SAAO); A. Becker, University of Washington (UW); H.
Brewington, Apache Point Observatory (APO); C. Choi, Seoul National
University (SNU); D. Cinabro, Wayne State University; F. DeJongh, Fermilab;
J. Dembicky, APO; D. L. DePoy, Ohio State University (OSU); B. Dilday,
University of Chicago (UC); M. Doi, University of Tokyo (UoT); 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,
Stanford University (SU); K. Konishi, UoT; J. Krzesinski, APO; H. Lampeitl,
Space Telescope Science Institute (STScI); R. Kessler, UC; B. Ketzeback, D.
Long, O. Malanushenko, and V. Malanushenko, APO; J. Marriner and D.
McGinnis, Fermilab; R. McMillan, APO; G. Miknaitis, Fermilab; T. Morokuma,
UoT; R. Nichol, University of Portsmouth (UP); K. Pan, APO; J. L. Prieto,
OSU; M. Richmond, Rochester Institute of Technology; A. Riess, STScI; R.
Romani, SU; M. Sako, University of Pennsylvania; G. Saurage, APO; D.
Schneider, Pennsylvania State University; M. Smith, UP; S. Snedden, APO; N.
Takanashi and K. Tokita, UoT; K. van der Heyden, SAAO; S. Watters, APO; C.
Wheeler, University of Texas; N. Yasuda, UoT; and C. Zheng, SU, on behalf
of the Sloan Digital Sky Survey II collaboration, report the discovery of
four new supernovae on multiple g, r, and i images taken with the SDSS
2.5-m telescope at APO by the SDSS observing team.  Marriner, McGinnis,
and Dembicky report that observations with the ARC 3.5-m telescope at APO
on Oct. 2 UT indicate that 2006ia, 2006ib, and 2006hy are all type-Ia
supernovae.  Romani, Zheng, Sako, Wheeler, and Schneider, together with U.
Hopp (University of Munich) and W. Kollatschny (University of Goettingen),
report that spectroscopic observations with the Hobby Eberly Telescope on
Sept. 30 indicate that 2006hz is a type-II supernova.  The discovery
magnitudes tabulated below are all SDSS g magnitudes.  Spectroscopic
redshifts are given in the column labelled "z".  Peak dates (all 2006) are
approximate estimates from early fits to the multi-band light curves.

SN       Discov.       R.A. (2000.0) Decl.     Mag.    z    Estimated
         Date  UT                                           Peak Date
2006hy   Sept. 15   22 08 19.43  - 1 11 47.0   22.3   0.14   Oct. 2
2006hz   Sept. 19    0 12 41.00  - 0 32 07.7   21.6   0.23   Oct. 1
2006ia   Sept. 22    2 07 19.18  + 1 15 07.5   21.0   0.18   Oct. 3
2006ib   Sept. 22    3 16 11.83  - 0 36 03.4   22.1   0.18   Oct. 8


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2006 CBAT
2006 October 3                   (CBET 657)               Daniel W. E. Green