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The extreme, red afterglow of GRB 060923A : distance or dust?
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Tanvir, Nial R., Levan, A. J., Rol, E., Starling, R. L. C., Gorosabel, J., Priddey, R. S., Malesani, D., Jakobsson, P., O'Brien, P. T. (Paul T.), Jaunsen, A. O., Hjorth, J. (Jens), Fynbo, J. P. U., Melandri, A., Gomboc, A., Milvang-Jensen, B., Fruchter, Andrew S., Jarvis, M., Fernandes, C. A. C. and Wold, T. (2008) The extreme, red afterglow of GRB 060923A : distance or dust? Monthly Notices of the Royal Astronomical Society, Vol.388 (No.4). pp. 1743-1750. doi:10.1111/j.1365-2966.2008.13496.x
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Official URL: http://dx.doi.org/10.1111/j.1365-2966.2008.13496.x
Abstract
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.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QB Astronomy | ||||
| Divisions: | Faculty of Science > Physics | ||||
| Library of Congress Subject Headings (LCSH): | Red shift -- Observations, Galaxies -- Observations, Gamma ray bursts | ||||
| Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||
| Publisher: | Wiley | ||||
| ISSN: | 0035-8711 | ||||
| Official Date: | 21 August 2008 | ||||
| Dates: |
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| Volume: | Vol.388 | ||||
| Number: | No.4 | ||||
| Number of Pages: | 8 | ||||
| Page Range: | pp. 1743-1750 | ||||
| DOI: | 10.1111/j.1365-2966.2008.13496.x | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access |
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