[IAUC] CBET 1081: 20070921 : SUPERNOVAE 2007jy-2007kb

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                                                  Electronic Telegram No. 1081
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 2007jy-2007kb
     Further to CBETs 611 and 1079, B. Bassett, South African Astronomical
Observatory (SAAO); 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 (WSU); 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 (UoT); J. Eastman, OSU; J. Frieman, Fermilab and UC; C. Gall, Dark
Cosmology Centre (DCC), University of Copenhagen; P. Garnavich, University
of Notre Dame (UND); A. Goobar, Stockholm University; C. Hogan, UW; J.
Holtzman, New Mexico State University; M. Im, SNU; S. Jha, Rutgers
University; K. Konishi, UoT; 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, K. Pan, APO; L. Ostman, Stockholm
University, 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; J. Sollerman and M.
Stritzinger, DCC; N. Takanashi and K. Tokita, UoT; M. F. Taylor, WSU; K. van
der Heyden, University of Cape Town; S. Watters, APO; N. Yasuda, UoT; 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
supernovae on g, r, and i images taken with the SDSS 2.5-m telescope at APO
by the SDSS observing team.  A. Aragon-Salamanca (University of Nottingham),
M. Bremer (University of Bristol), M. Turatto (University of Padova), A.
Goobar, R. Nichol, J. Sollerman, P. Ruiz-Lapuente (University of Barcelona),
F. Castander (Institut de Ciencies de l'Espai, Centre d'Estudis Avancats
de Blanes, Barcelona), A. K. Romer (University of Sussex), C. Collins
(Liverpool John Moores University), J. Lucey and A. Edge (University of
Durham) report that confirming spectroscopy was obtained with the European
Southern Observatory's New Technology Telescope on the night of Sept. 19
for 2007kb, 2007jy, and 2007jz by M. Smith and L. Ostman.  M. Stritzinger, C.
Gall, and J. Sollerman report that spectroscopy was obtained by Stritzinger
and Gall on the Nordic Optical Telescope on the night of Sept. 19 for 2007ka.
The discovery magnitudes tabulated below are all g magnitudes; spectroscopic
redshifts are given in the column labelled z.  Peak dates (all 2007) are
approximate estimates either from fits to the early light curves or from the
spectra, with a typical uncertainty of plus-or-minus several days; in cases
where such estimates are either uncertain or very discrepant, they are not
reported.  Spectroscopic types marked with a question mark (?) imply that
the type identification based on the spectrum is uncertain.

SN       Discov.       R.A. (2000.0) Decl.     Mag.    z    Estimated   Type
         Date UT                                            Peak Date
2007jy   Sep.  3    20 51 21.43  + 0 23 57.8   20.7   0.18   Sep.  4     Ib?
2007jz   Sep.  5     1 23 56.01  + 1 15 18.0   21.7   0.22   Sep. 15     Ia
2007ka   Sep.  5     1 21 22.70  - 0 00 53.3   21.1   0.22   Sep. 12     Ia
2007kb   Sep. 13    20 52 24.71  + 0 16 39.6   21.4   0.14   Sep. 15     Ia


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                         (C) Copyright 2007 CBAT
2007 September 21                (CBET 1081)              Daniel W. E. Green