GRB 080913 AT REDSHIFT 6.7
J. GreinerMax-Planck-Institut für extraterrestrische Physik, Giessenbachstraße 1, D-85740 Garching, GermanyT. KrühlerMax-Planck-Institut für extraterrestrische Physik, Giessenbachstraße 1, D-85740 Garching, GermanyJ. P. U. FynboDark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, DK-2100 København Ø, DenmarkA. RossiThüringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenburg, GermanyR. SchwarzAstrophysical Institute Potsdam, D-14482 Potsdam, An der Sternwarte 16, GermanyS. KloseThüringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenburg, GermanyS. SavaglioMax-Planck-Institut für extraterrestrische Physik, Giessenbachstraße 1, D-85740 Garching, GermanyN. R. TanvirDepartment of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UKS. McBreenMax-Planck-Institut für extraterrestrische Physik, Giessenbachstraße 1, D-85740 Garching, GermanyTomonori TotaniDepartment of Astronomy, Kyoto University, Sakyo-ku, Kyoto 606-8502, JapanBingbing ZhangDepartment of Physics and Astronomy, University of Nevada, 4505 Maryland Parkway, Las Vegas, NV 89154-4002, USAXue-Feng WuDepartment of Astronomy & Astrophysics, Pennsylvania State University, 525 Davey Lab, University Park, PA 16802, USAD. WatsonDark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, DK-2100 København Ø, DenmarkA. P. BeardmoreNASA-GSFC, Code 661, Greenbelt, MD 20771, USAP. FerreroThüringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenburg, GermanyN. GehrelsNASA-GSFC, Code 661, Greenbelt, MD 20771, USAД. А. КаннThüringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenburg, GermanyN. KawaiDepartment of Physics, Tokyo Inst. of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, JapanA. YoldaşESO, Karl-Schwarzschild-Str. 2, 85740 Garching, GermanyP. MészárosDepartment of Astronomy & Astrophysics, Pennsylvania State University, 525 Davey Lab, University Park, PA 16802, USAB. Milvang‐JensenDark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, DK-2100 København Ø, DenmarkS. R. OatesMullard Space Science Lab, University College London, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, UKD. PieriniMax-Planck-Institut für extraterrestrische Physik, Giessenbachstraße 1, D-85740 Garching, GermanyP. SchadyMullard Space Science Lab, University College London, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, UKKenji TomaDepartment of Astronomy & Astrophysics, Pennsylvania State University, 525 Davey Lab, University Park, PA 16802, USAP. M. VreeswijkDark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, DK-2100 København Ø, DenmarkBing ZhangDepartment of Physics and Astronomy, University of Nevada, 4505 Maryland Parkway, Las Vegas, NV 89154-4002, USAP. AfonsoMax-Planck-Institut für extraterrestrische Physik, Giessenbachstraße 1, D-85740 Garching, GermanyKentaro AokiSubaru Telescope, National Astronomical Observatory of Japan, 650 North A`ohōkū Place, Hilo, HI 96720, USAD. BurrowsDepartment of Astronomy & Astrophysics, Pennsylvania State University, 525 Davey Lab, University Park, PA 16802, USAC. ClemensMax-Planck-Institut für extraterrestrische Physik, Giessenbachstraße 1, D-85740 Garching, GermanyR. FilgasMax-Planck-Institut für extraterrestrische Physik, Giessenbachstraße 1, D-85740 Garching, GermanyZoltán HaimanDepartment of Astronomy, Columbia University, 1328 Pupin Physics Laboratories, New York, NY 10027, USAD. H. HartmannDepartment of Physics and Astronomy, Clemson University, Clemson, SC 29634, USAG. HasingerMax-Planck-Institut für extraterrestrische Physik, Giessenbachstraße 1, D-85740 Garching, GermanyJ. HjorthDark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, DK-2100 København Ø, DenmarkE. JehinInst. d'Astrophysique de l'Université de Liège, Allée du 6 Août 17, B-4000 Liège, BelgiumA. J. LevanDepartment of Physics, University of Warwick, Coventry CV4 7AL, UKEn‐Wei LiangDepartment of Physics, Guangxi University, Guangxi 53004, ChinaD. MalesaniDark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, DK-2100 København Ø, DenmarkTae‐Soo PyoSubaru Telescope, National Astronomical Observatory of Japan, 650 North A`ohōkū Place, Hilo, HI 96720, USAS. SchulzeThüringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenburg, GermanyG. SzokolyEötvös Univ., 1117 Budapest, Pazmany P. stny. 1/A, HungaryKentaro TeradaMax-Planck-Institut für extraterrestrische Physik, Giessenbachstraße 1, D-85740 Garching, GermanyK. WiersemaDepartment of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UK
2009en
ABI
Аннотация
We report on the detection by Swift of GRB 080913, and subsequent optical/near-infrared follow-up observations by GROND, which led to the discovery of its optical/NIR afterglow and the recognition of its high-z nature via the detection of a spectral break between the i and z bands. Spectroscopy obtained at the ESO-VLT revealed a continuum extending down to λ = 9400 Å, and zero flux for 7500 Å<λ< 9400 Å, which we interpret as the onset of a Gunn–Peterson trough at z = 6.695± 0.025 (95.5% confidence level), making GRB 080913 the highest-redshift gamma-ray burst (GRB) to date, and more distant than the highest-redshift QSO. We note that many redshift indicators that are based on promptly available burst or afterglow properties have failed for GRB 080913. We report on our follow-up campaign and compare the properties of GRB 080913 with bursts at lower redshift. In particular, since the afterglow of this burst is fainter than typical for GRBs, we show that 2 m class telescopes can identify most high-redshift GRBs.
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