[IAUC] CBET 643: 20060924 : SUPERNOVAE 2006fo, 2006gu-2006gx

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                                                  Electronic Telegram No. 643
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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SUPERNOVAE 2006fo, 2006gu-2006gx
     Further to CBETs 611 and 637, 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, 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; 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 type-Ia supernovae on
multiple g, r, and i images taken with the SDSS 2.5-m telescope at Apache
Point Observatory by the SDSS observing team.  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. 20 and 21 UT show that
the four new objects are all type-Ia supernovae.  The discovery magnitudes
tabulated below are all SDSS g magnitudes.  Spectroscopic redshifts are
given in the column labelled "z".  Peak dates (all 2006) of expected
maximum brightness are estimates from early fits to the multi-band light
curves.

SN       Discov.      R.A. (2000.0) Decl.     Mag.    z    Estimated
         Date UT                                           Peak Date
2006gu   Aug. 27    0 40 38.96  - 0 04 24.9   21.1   0.24   Aug. 29
2006gv   Sept.11    1 48 36.37  + 0 19 41.6   21.0   0.20   Sept.13
2006gw   Sept.11    1 57 53.50  - 0 32 02.9   21.7   0.33   Sept.11
2006gx   Sept.16    2 48 14.08  - 0 20 49.3   21.2   0.18   Sept.13

In addition, they report that further analysis of the NTT spectrum of
2006fo (Cf. CBET 624) shows it to be consistent with a type-Ic supernova,
with features similar to that of 1999ex.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2006 CBAT
2006 September 24                (CBET 643)               Daniel W. E. Green