[IAUC] CBET 1098: 20071009 : SUPERNOVAE 2007ju and 2007kl-2007ld
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Electronic Telegram No. 1098
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)
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SUPERNOVAE 2007ju and 2007kl-2007ld
Further to CBETs 611 and 1081, B. Bassett, South African Astronomical
Observatory; 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; 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 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,
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 II collaboration, report the discovery of nineteen 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,
R. Bender, U. Hopp (University of Munich), and W. Kollatschny (University
of Goettingen) add that confirming spectroscopy was obtained at the Hobby-
Eberly Telescope on the nights of Sept. 23 (2007km) and Oct. 5 (2007kn,
2007kp, and 2007ku). R. Assef, M. Peeples, and J. Prieto (OSU) obtained
confirming spectroscopy of 2007ks at the Hiltner 2.4-m telescope on the night
of Sept. 28. A. Goobar, R. Nichol, and M. Molla, Centro de Investigaciones
Energeticas, Medioambientales y Tecnologicas, Madrid); F. Castander, Institut
de Ciencies de l'Espai, Barcelona; and R. Miquel, Institut de Fisica d'Altes
Energies, Barcelona), report that confirming spectroscopy was taken by
Castander and Miquel at the 3.58-m Telescopio Nazionale Galileo on La Palma
on the nights of Oct. 6-7 for 2007lb, 2007kt, 2007kw, 2007kz, and 2007ky.
J. Marriner, D. McGinnis (Fermilab), and G. Miknaitis report that confirming
spectroscopy of 2007la and 2007lc was taken on the nights of Oct. 4 and 7,
respectively. S. Jha, Rutgers University; and P. Challis, G. Narayan, and
R. Kirshner, Harvard University, report that confirming spectroscopy was
taken with the Magellan Clay 6.5-m telescope (+ LDSS3) on the nights of Oct.
6-8 for 2007kx, 2007ld, 2007kl, 2007kr, 2007ko, 2007kq, 2007kv, and 2007ku.
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. Types marked with a question mark (?) imply that the type
identification based on the spectrum is uncertain.
In addition, observations with the Hiltner 2.4-m telescope at MDM on
Sept. 29 indicate that 2007ju, originally reported on CBET 1079 as a
possible type-Ic event, is in fact a type-Ia supernova.
SN Discov. R.A. (2000.0) Decl. Mag. z Estimated Type
Date UT Peak Date
2007kl Sep. 3 2 44 50.90 + 0 21 53.4 21.9 0.26 Sep. 10 Ia
2007km Sep. 4 2 48 20.07 - 0 17 17.3 21.1 0.25 Sep. 1 Ia
2007kn Sep. 13 20 48 09.42 - 1 00 55.4 22.0 0.22 -- II?
2007ko Sep. 13 21 04 22.37 - 0 53 52.8 21.8 0.21 Sep. 20 Ia
2007kp Sep. 13 22 09 29.59 + 0 44 16.4 22.3 0.29 Sep. 22 Ia
2007kq Sep. 14 0 19 43.91 - 0 24 00.5 22.5 0.16 Oct. 4 Ia
2007kr Sep. 14 0 25 27.50 - 0 50 22.5 22.0 0.29 Sep. 23 Ia/c?
2007ks Sep. 14 20 49 33.06 - 0 45 42.2 22.9 0.10 Sep. 25 Ia
2007kt Sep. 15 1 50 23.96 + 1 10 19.5 21.2 0.24 Sep. 24 Ia
2007ku Sep. 16 1 33 28.21 + 0 31 28.8 22.7 0.37 Sep. 24 Ia
2007kv Sep. 19 1 10 15.84 + 0 28 19.3 22.1 0.26 Oct. 1 Ia
2007kw Sep. 19 2 10 16.84 - 0 15 57.1 20.2 0.07 Sep. 23 II
2007kx Sep. 22 0 13 42.88 + 0 39 07.8 20.8 0.16 Sep. 30 Ia
2007ky Sep. 22 1 06 11.53 - 0 36 50.9 20.7 0.07 Oct. 3 II
2007kz Sep. 22 3 36 04.57 - 0 12 04.4 21.8 0.13 Oct. 3 II
2007la Sep. 30 22 29 54.78 + 1 03 30.9 20.4 0.13 Oct. 3 Ia
2007lb Oct. 3 3 49 09.53 - 0 44 09.2 19.0 0.06 Oct. 9 II
2007lc Oct. 6 0 49 09.10 + 0 35 49.2 19.6 0.12 Oct. 3 Ia
2007ld Oct. 6 20 49 29.59 + 0 00 14.0 17.9 0.03 Oct. 7 II
NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.
(C) Copyright 2007 CBAT
2007 October 9 (CBET 1098) Daniel W. E. Green
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