Electronic Telegram No. 621
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://cfa-www.harvard.edu/iau/cbat.html


SUPERNOVAE 2006er, 2006ew-2006fc
     Further to CBET 611, 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 (UT); 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, UT; 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, UT; 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, UT; K. van der
Heyden, SAAO; S. Watters, APO; N. Yasuda, UT; and C. Zheng, SU, on behalf
of the Sloan Digital Sky Survey II collaboration, report the discovery of
seven 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.  For one
of the candidates, 2006fc, a second epoch of imaging confirming the apparent
supernova was taken on Sept. 12 UT by A. Rau, E. Ofek, A. Soderberg, and S.
Kulkarni using the Palomar 1.5-m telescope.  A. Aragon-Salamanca,
University of Nottingham; M. Bremer, University of Bristol; M. Turatto,
University of Padova; A. Goobar, University of Stockholm; J. Sollerman,
University of Copenhagen; P. Ruiz-Lapuente and F. Castander, University of
Barcelona; A. Romer, University of Sussex, C. Collins, Liverpool John
Moores University; and J. Lucey and A. Edge, University of Durham, report
that spectroscopy obtained by R. Nichol and M. Smith on the night of Sept.
13 UT with the ESO 3.6-m New Technology Telescope show five of the new
supernovae to be type-Ia events, one to be a type II event (2006ez), and
one to be a possible type-Ia event (2006fa).  The discovery magnitudes
tabulated below are all g magnitudes, and discovery dates are UT.
Spectroscopic redshifts are given in the column labelled z.  Peak g
magnitudes and dates (all 2006) are estimates from early fits to the
multi-band light curves.

SN      Discov.      R.A. (2000.0) Decl.     Mag.    z     Estimated Peak
        Date                                                Date      Mag.
2006ew  Aug. 27   20 20 02.17  - 0 58 32.5   20.1   0.14   Aug. 22   20.0
2006ex  Aug. 27   20 38 43.86  - 0 28 28.3   20.1   0.14   Aug. 29   20.1
2006ey  Aug. 27   21 07 03.73  + 0 43 23.1   20.5   0.17   Aug. 29   20.5
2006ez  Aug. 27   21 33 49.26  - 1 00 57.4   20.3    --    Sep. 14   19.3
2006fa  Aug. 27   21 35 30.74  - 0 58 49.0   20.8    --    Sept. 2   20.4
2006fb  Aug. 27   23 35 51.51  - 0 10 37.6   21.1   0.24   Sept. 2   20.9
2006fc  Sep. 11   21 34 46.61  + 1 10 33.3   20.4   0.12   Sept. 8   20.3

     In addition, a New Technology Telescope spectrum of 2006er shows it to
be a type-Ia event two to three weeks past maximum light, with a redshift
consistent with that of the SDSS host galaxy reported on CBET 611.


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

                         (C) Copyright 2006 CBAT
2006 September 14                (CBET 621)               Daniel W. E. Green