期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 388, 期 4, 页码 1743-1750出版社
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2008.13496.x
关键词
galaxies : high-redshift; gamma-rays : bursts
资金
- STFC [ST/F002599/1, ST/F006489/1, PP/E002064/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/F006489/1, ST/F002599/1, PP/E002064/1] Funding Source: researchfish
Gamma-ray bursts (GRBs) are powerful probes of the early Universe, but locating and identifying very distant GRBs remain challenging. We report here the discovery of the K-band afterglow of Swift GRB 060923A, imaged within the first hour post-burst, and the faintest so far found. It was not detected in any bluer bands to deep limits, making it a candidate very high-z burst (z greater than or similar to 11). However, our later-time optical imaging and spectroscopy reveal a faint galaxy coincident with the GRB position which, if it is the host, implies a more moderate redshift (most likely z less than or similar to 2.8) and therefore that dust is the likely cause of the very red-afterglow colour. This being the case, it is one of the few instances so far found of a GRB afterglow with high-dust extinction.
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