期刊
ASTROPHYSICAL JOURNAL
卷 693, 期 2, 页码 1610-1620出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/693/2/1610
关键词
early universe; gamma rays: bursts; radiation mechanisms: non-thermal
资金
- XMM-Newton SOC
- DFG
- EU [MEIF-CT-2006-041363]
- Leibniz-Prize [HA 1850/28-1]
- European Southern Observatory, Chile [081.A-0135, 081.A-0856, 081.A-0966]
- Science and Technology Facilities Council [PP/E002064/1, ST/F006489/1, ST/F002599/1] Funding Source: researchfish
- Grants-in-Aid for Scientific Research [19047003] Funding Source: KAKEN
- STFC [PP/E002064/1, ST/F002599/1, ST/F006489/1] Funding Source: UKRI
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 lambda = 9400 angstrom, and zero flux for 7500 angstrom< lambda < 9400 angstrom, 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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