[IAUC] CBET 1057: 20070910 : SUPERNOVAE 2007hw-2007ie

Lun Sep 10 18:40:52 ART 2007

                                                  Electronic Telegram No. 1057
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS en CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT en CFA.HARVARD.EDU (science)
URL http://www.cfa.harvard.edu/iau/cbat.html


SUPERNOVAE 2007hw-2007ie
     Further to CBETs 611 and 786, B. Bassett, South African Astronomical
Observatory; A. Becker, University of Washington (UW); H. Brewington,
Apache Point Observatory (APO); C. Choi, Seoul National University (SNU);
D. Cinabro, Wayne State University; 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 (UT); J.
Eastman, OSU; 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, Rutgers University; K. Konishi, UT; 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;
K. Pan, APO; 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; M. Smith, UP; S. Snedden, APO; N. Takanashi and K. Tokita, UT;
K. van der Heyden, University of Cape Town; S. Watters, APO; N. Yasuda, UT;
C. Wheeler, University of Texas; and C. Zheng, SU, on behalf of the Sloan
Digital Sky Survey (SDSS) II collaboration, report the discovery of nine
supernovae on g, r, and i images taken with the SDSS 2.5-m telescope at APO
by the SDSS observing team.  D. Atlee, J. Eastman, and J. Prieto (OSU)
report that spectroscopy obtained with the Hiltner 2.4-m telescope at MDM
Observatory on the nights of Sept. 8 and 9 shows six of the new objects to
be type-Ia supernovae, one to be a probable type-Ia supernova, and two to
be type-II supernovae.  The discovery magnitudes tabulated below are all g
magnitudes.  Spectroscopic redshifts are given in the column labelled z.
Peak dates are approximate estimates from the spectra, with a typical
uncertainty of +/- 2 to 3 days.

SN       Discov.       R.A. (2000.0) Decl.     Mag.    z    Estimated   Type
         Date UT                                            Peak Date
2007hw   Sept. 3     2 03 35.16  + 0 47 10.3   20.4   0.08   Sept. 6     II
2007hx   Sept. 3     2 06 27.08  - 0 53 58.3   19.5   0.08   Sept. 8     Ia
2007hy   Sept. 3     3 39 42.33  + 1 05 32.2   20.9   0.19   Sept. 3     Ia
2007hz   Sept. 3    21 03 08.95  - 1 01 45.1   19.7   0.14   Sept. 8     Ia
2007ia   Sept. 4     3 43 10.06  + 0 06 08.9   20.0   0.13   Sept. 5     Ia
2007ib   Sept. 4    23 15 44.56  + 0 27 25.6   20.4   0.03   Sep. 11     II
2007ic   Sept. 5     0 05 57.98  + 1 06 11.1   20.0   0.14   Aug. 29     Ia
2007id   Sept. 5    21 46 00.49  - 1 13 03.9   20.2   0.16   Aug. 29     Ia
2007ie   Sept. 5    22 17 36.69  + 0 36 48.0   20.1   0.10   Aug. 27     Ia?


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

                         (C) Copyright 2007 CBAT
2007 September 10                (CBET 1057)              Daniel W. E. Green