Rowlinson 2010 GRB 080905A的光学余辉和宿主星系的观测

主要内容:
 z=0.1218, 是目前红移最低的短暴。没有超新星成分。短暴周围没有发射线，说明很有可能是双致密星起源。

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· arXiv e-print (arXiv:1006.0487)

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Title:		Discovery of the afterglow and host galaxy of the low redshift short GRB 080905A
Authors:		Rowlinson, A.; Wiersema, K.; Levan, A. J.; Tanvir, N. R.; O'Brien, P. T.; Rol, E.; Hjorth, J.; Thone, C. C.; de Ugarte Postigo, A.;Fynbo, J. P. U.; Jakobsson, P.; Pagani, C.; Stamatikos, M.
Publication:		eprint arXiv:1006.0487
Publication Date:		06/2010
Origin:		ARXIV
Keywords:		Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Cosmology and Extragalactic Astrophysics
Comment:		Accepted for publication in MNRAS, 10 pages, 5 figures
Bibliographic Code:		2010arXiv1006.0487R

Abstract

We present the discovery of short GRB 080905A, its optical afterglow and host galaxy. Initially discovered by Swift, our deep optical observations enabled the identification of a faint optical afterglow, and subsequently a face-on spiral host galaxy underlying the GRB position, with a chance alignment probability of <1%. There is no supernova component present in the afterglow to deep limits. Spectroscopy of the galaxy provides a redshift of z=0.1218, the lowest redshift yet observed for a short GRB. The GRB lies offset from the host galaxy centre by ~18.5 kpc, in the northern spiral arm which exhibits an older stellar population than the southern arm. No emission lines are visible directly under the burst position, implying little ongoing star formation at the burst location. These properties would naturally be explained were the progenitor of GRB 080905A a compact binary merger.

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