GRB 080913 at Redshift 6.7
- Greiner, J.
- Krühler, T.
- Fynbo, J. P. U.
- Rossi, A.
- Schwarz, R.
- Klose, S.
- Savaglio, S.
- Tanvir, N. R.
- McBreen, S.
- Totani, T.
- Zhang, B. B.
- Wu, X. F.
- Watson, D.
- Barthelmy, S. D.
- Beardmore, A. P.
- Ferrero, P.
- Gehrels, N.
- Kann, D. A.
- Kawai, N.
- Yoldaş, A Küpcü
- Mészáros, P.
- Milvang-Jensen, B.
- Oates, S. R.
- Pierini, D.
- Schady, P.
- Toma, K.
- Vreeswijk, P. M.
- Yoldaş, A.
- Zhang, B.
- Afonso, P.
- Aoki, K.
- Burrows, D. N.
- Clemens, C.
- Filgas, R.
- Haiman, Z.
- Hartmann, D. H.
- Hasinger, G.
- Hjorth, J.
- Jehin, Emmanuel
- Levan, A. J.
- Liang, E. W.
- Malesani, D.
- Pyo, T*-S
- Schulze, S.
- Szokoly, G.
- Terada, K.
- Wiersema, K.
DOIAbstract
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 f...
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