[IAUC] CBET 637: 20060921 : SUPERNOVAE 2006gk, 2006gl, 2006gm, 2006gn, 2006go, 2006gp, 2006gq

Vie Jun 22 17:05:32 ART 2007

                                                  Electronic Telegram No. 637
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 2006gk, 2006gl, 2006gm, 2006gn, 2006go, 2006gp, 2006gq
     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 (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 reports 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.  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. 18 and 19 UT show that five of the new
objects (2006gk, 2006gl, 2006gm, 2006go, and 2006gp) are type-Ia supernovae.
Spectroscopic observations with the Subaru 8-m telescope on Sept. 18 by M.
Doi, N. Takanashi, Y. Ihara, T. Morokuma, K. Tokita, K. Konishi, and N.
Yasuda indicate that 2006gq is a probable type-II supernova.  B. Bassett,
K. van der Heyden, and P. Vaisanen, SAAO, report that a spectrum of 2006gn,
taken with the South African Large Telescope on Sept. 18, shows it to be a
type-Ia supernova.  The discovery and peak magnitudes tabulated below are
all SDSS g magnitudes, with the exception of 2006go (r magnitude), and
discovery dates are UT.  Spectroscopic redshifts are given in the column
labelled "z".  Peak 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 UT                                             Date     Mag.
2006gk   Aug. 27   21 25 23.34  - 1 02 01.2   21.8   0.29   Aug. 20   21.6
2006gl   Aug. 28    1 05 50.11  + 0 08 41.3   21.6   0.27   Aug. 23   21.4
2006gm   Aug. 28   22 59 07.46  - 0 37 38.5   21.5   0.25   Aug. 17   21.3
2006gn   Aug. 28   23 11 18.43  + 0 30 16.6   20.2   0.10   Sept. 8   19.1
2006go   Sept.12    0 24 33.76  - 0 16 44.7   22.0r  0.37   Sept.18   22  r
2006gp   Sept.15   22 34 10.00  + 0 03 17.9   22.2   0.21   Sept. 7   21.8
2006gq   Sept.17    1 45 12.54  + 0 21 23.2   20.2   0.07     --       --


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                         (C) Copyright 2006 CBAT
2006 September 21                (CBET 637)               Daniel W. E. Green