GRB 080913 at Redshift 6.7

[en] 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.

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

Greiner, J.; Max-Planck-Institut für extraterrestrische Physik, Garching bei München, Germany

Krühler, T.; Max-Planck-Institut für extraterrestrische Physik, Garching bei München, Germany ; Universe Cluster, Technische Universität München, Boltzmannstrasse 2, D-85748, Garching bei München, Germany

Fynbo, J. P. U.; Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, DK-2100 København Ø, Denmark

Rossi, A.; Thüringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenburg, Germany

Schwarz, R.; Astrophysical Institute Potsdam, D-14482 Potsdam, An der Sternwarte 16, Germany

Klose, S.; Thüringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenburg, Germany

Savaglio, S.; Max-Planck-Institut für extraterrestrische Physik, Garching bei München, Germany

Tanvir, N. R.; Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UK

McBreen, S.; Max-Planck-Institut für extraterrestrische Physik, Garching bei München, Germany

Totani, T.; Department of Astronomy, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan

More authors (37 more)

Language :

English

Title :

GRB 080913 at Redshift 6.7

Publication date :

01 March 2009

Journal title :

Astrophysical Journal

ISSN :

0004-637X

eISSN :

1538-4357

Publisher :

University of Chicago Press, Chicago, United States - Illinois

Volume :

693

Pages :

1610-1620

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

http://adsabs.harvard.edu/abs/2009ApJ...693.1610G

Commentary :

http://de.arxiv.org/abs/0810.2314

Available on ORBi :

since 11 January 2012

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