[IAUC] CBET 1167: 20071212 : SUPERNOVAE 2007rg AND 2007sb-2007sn

Mie Dic 12 18:40:22 ART 2007

                                                  Electronic Telegram No. 1167
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 2007rg AND 2007sb-2007sn
     Further to CBETs 611 and 1146, 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; 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, Dark Cosmology Centre; 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 thirteen type-Ia supernovae on g, r, and i images taken with the
SDSS 2.5-m telescope at APO by the SDSS observing team.  R. Romani, C. Zheng,
M. Sako, C. Wheeler, D. Schneider, and R. Bender, together with and U. Hopp
(University of Munich) and W. Kollatschny (University of Goettingen), report
confirming spectroscopy that was obtained at the Hobby-Eberly Telescope on
on Nov. 5 and 9 UT for 2007sc and 2007sk, and on Nov. 17 for 2007sb.  J. L.
Prieto and D. DePoy report confirming spectroscopy for 2007sh and 2007si that
was obtained by R. Assef and D. Atlee (OSU) on the Hiltner 2.4-m telescope
at MDM Observatory on Nov. 23 and 25.  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 (ICE/CSIC, Barcelona), A. K. Romer (University of
Sussex), C. Collins (Liverpool John Moores University), and J. Lucey and A.
Edge (University of Durham) report confirming spectroscopy of 2007sl and
2007sm that was obtained by D. Wake (Durham) on Dec. 3 at the William
Herschel 4.2-m telescope, and confirming spectroscopy for 2007sd, 2007se,
2007sf, 2007sg, 2007sj, and 2007sn that was obtained by M. Smith and A. K.
Romer on Dec. 7, 8, and 9 at the European Southern Observatory's New
Technology Telescope.  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 from fits to the early
light curves, with a typical uncertainty of plus-or-minus two days.

SN       Discov.       R.A. (2000.0) Decl.     Mag.    z    Estimated   Type
         Date UT                                            Peak Date
2007sb   Oct. 11     0 41 23.75  + 0 24 43.0   22.0   0.21   Oct. 20    Ia
2007sc   Nov. 11     2 15 11.87  + 0 32 09.3   22.1   0.27   Nov. 20    Ia
2007sd   Nov. 11     3 32 00.58  - 0 39 42.7   21.0   0.09   Nov. 21    IIP
2007se   Nov. 12    22 12 37.10  + 0 47 48.2   22.3   0.18   Nov. 27    Ia
2007sf   Nov. 12    22 48 59.11  + 1 12 21.9   22.3   0.10   Nov. 29    Ia
2007sg   Nov. 12    23 19 26.09  - 0 54 05.9   22.7   0.19   Nov. 28    Ia
2007sh   Nov. 12     0 29 24.67  + 0 49 53.4   21.2   0.15   Nov. 26    Ia
2007si   Nov. 12     1 59 51.14  + 1 12 59.3   20.8   0.13   Nov. 22    Ia
2007sj   Nov. 17     0 10 39.63  - 0 03 10.2   21.2   0.04   Nov. 29    Ib/c
2007sk   Nov. 17     1 27 05.25  + 1 12 54.5   21.9   0.23   Nov. 27    II
2007sl   Nov. 17    21 13 42.82  - 0 50 16.0   21.3   0.10   Dec.  5    Ia
2007sm   Nov. 27    21 22 50.57  + 0 25 17.9   20.4   0.06   Dec. 14    Ia
2007sn   Nov. 27    22 14 04.42  - 0 12 47.5   21.3   0.14   Dec. 11    Ia

Corrigendum.  Re-analysis of the spectrum of 2007rg (cf. CBET 1146) by M.
Sullivan (University of Oxford) indicates that its redshift is 0.27.

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

                         (C) Copyright 2007 CBAT
2007 December 12                 (CBET 1167)              Daniel W. E. Green