[IAUC] CBET 1109: 20071027 : SUPERNOVAE 2007lx AND 2007nr-2007oa

Sab Oct 27 15:00:20 ART 2007

                                                  Electronic Telegram No. 1109
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 2007lx AND 2007nr-2007oa
     Further to CBETs 611 and 1104, B. Bassett, South African Astronomical
Observatory and University of Cape Town (UCT); 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; P. Garnavich, University of Notre Dame;
A. Goobar, Stockholm University; C. Hogan, UW; J. Holtzman, New Mexico State
University; M. Im, SNU; S. Jha, Rutgers University; R. Kessler, UC; B.
Ketzeback, APO; K. Konishi, UoT; J. Krzesinski, APO; H. Lampeitl, University
of Portsmouth (UP); G. Leloudas, Dark Cosmology Centre (DCC), University of
Copenhagen; 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 and 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, UCT; S. Watters, APO; N.
Yasuda, UoT; C. Wheeler, University of Texas; and C. Zheng, SU, on behalf of
the Sloan Digital Sky Survey II collaboration, report the discovery of ten
supernovae on g, r, and i images taken with the SDSS 2.5-m telescope at APO
by the SDSS observing team.  J. Marriner, D. McGinnis (Fermilab), G.
Miknaitis, A. Becker, J. Frieman, J. Holtzman, and A. Riess also report
confirming spectroscopy for 2007nt, obtained with the ARC 3.5-m telescope on
Oct. 18 UT.  M. Sako, C. D'Andrea, and N. Yasuda report confirming
spectroscopy for 2007nr, 2007nv, 2007nw, 2007nx, 2007ny, and 2007oa that
was obtained on the Subaru 8-m telescope on Oct. 19; they add that a Subaru
spectrum of 2007lx obtained on the same night shows it to be a type-II
supernova (this object was previously reported on CBET 1102 as a possible
type-II event).  R. Romani, C. Zheng, M. Sako, C. Wheeler, D. Schneider, and
R. Bender, together with U. Hopp (University of Munich) and W. Kollatschny
(University of Goettingen), report confirming spectroscopy that was obtained
at the Hobby-Eberly Telescope on Oct. 19 and 20 for 2007ns, 2007nu, and
2007nz.  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
2007nr   Sep. 15     1 01 59.47  + 0 40 55.0   21.5   0.14   Sep. 20    II-P
2007ns   Sep. 22     2 37 02.97  - 0 51 59.8   22.5   0.37   Oct.  2    Ia
2007nt   Oct.  3     3 06 43.80  - 0 45 14.5   22.1   0.21   Oct. 13    Ia
2007nu   Oct.  3     3 11 50.18  - 0 41 32.7   21.8   0.28   Oct. 12    Ia
2007nv   Oct.  6     0 05 30.34  - 1 12 16.4   21.5   0.14   Oct.  5    II-P
2007nw   Oct.  6    20 47 11.37  - 1 15 26.0   20.5   0.06   Oct.  1    II-P
2007nx   Oct.  8     0 03 48.36  + 0 21 31.4   20.6    --    Oct.  5    IIn
2007ny   Oct.  8     1 40 55.52  + 0 13 07.8   21.4   0.14   Oct. 12    II-P
2007nz   Oct.  8     3 25 11.35  - 0 06 22.5   22.8   0.47   Oct. 12    Ia?
2007oa   Oct.  9    22 13 51.35  - 0 55 13.0   21.8    --    Oct.  8    Ia


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

                         (C) Copyright 2007 CBAT
2007 October 27                  (CBET 1109)              Daniel W. E. Green