The extreme, red afterglow of GRB 060923A: Distance or dust?

Details The extreme, red afterglow of GRB 060923A: Distance or dust? The extreme, red afterglow of GRB 060923A: Distance or dust?

2008-03-28

arxiv.org/abs/0803.4100v1

Mon.Not.Roy.Astron.Soc.388:1743-1750, 2008

Astronomy and Astrophysics

Astrophysics

Submitted to MNRAS (revised in light of referee's comments)

Scientific paper

10.1111/j.1365-2966.2008.13496.x

Gamma-ray bursts are powerful probes of the early universe, but locating and identifying very distant GRBs remains 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 redshift burst (z>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<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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