Tanvir 2008 GRB 060823A的超红余辉

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Title:		The extreme, red afterglow of GRB 060923A: Distance or dust?
Authors:		Tanvir, N. R.; Levan, A. J.; Rol, E.; Starling, R. L. C.; Gorosabel, J.; Priddey, R. S.; Malesani, D.; Jakobsson, P.; O'Brien, P. T.; Jaunsen, A. O.; Hjorth, J.; Fynbo, J. P. U.; Melandri, A.; Gomboc, A.; Milvang-Jensen, B.; Fruchter, A. S.; Jarvis, M.; Fernandes, C. A. C.; Wold, T.
Publication:		eprint arXiv:0803.4100
Publication Date:		03/2008
Origin:		ARXIV
Keywords:		Astrophysics
Comment:		Submitted to MNRAS (revised in light of referee's comments)
Bibliographic Code:		2008arXiv0803.4100T

Abstract

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)> Bibtex entry for this abstract Preferred format for this abstract (see Preferences)