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Closing in on a short-hard burst progenitor: Constraints from early-time optical imaging and spectroscopy of a possible host galaxy of GRB 050509b

Bloom, JS and Prochaska, JX and Pooley, D and Blake, CH and Foley, RJ and Jha, S and Ramirez-Ruiz, E and Granot, J and Filippenko, AV and Sigurdsson, S and Barth, AJ and Chen, HW and Cooper, MC and Falco, EE and Gal, RR and Gerke, BF and Gladders, MD and Greene, JE and Hennanwi, J and Ho, LC and Hurley, K and Koester, BP and Li, W and Lubin, L and Newman, J and Perley, DA and Squires, GK and Wood-Vasey, WM (2006) Closing in on a short-hard burst progenitor: Constraints from early-time optical imaging and spectroscopy of a possible host galaxy of GRB 050509b. The Astrophysical Journal, 638 (1). ISSN 1538-4357

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Abstract

The localization of the short-duration, hard-spectrum gamma-ray burst GRB 050509b by the Swift satellite was a watershed event. We report the discovery of the probable host galaxy, a bright elliptical galaxy atz = 0.2248. This is the first known redshift and host of a short-hard GRB and shows that at least some short-hard GRBs are cosmological in origin. We began imaging the GRB field 8 minutes after the burst and continued for 8 days. We present a reanalysis of the XRT afterglow and report the absolute position of the GRB. Based on positional coincidences, the GRB and the elliptical are likely to be physically related, unlike any known connection between a long-duration GRB and an early-type galaxy. Similarly unique, GRB 050509b likely also originated from within a rich cluster of galaxies with detectable diffuse X-ray emission. We demonstrate that while the burst was underluminous, the ratio of the blast wave energy to the γ-ray energy is consistent with that of long-duration GRBs. Based on this analysis, on the location of the GRB (40 ± 13 kpc from the putative host), on the galaxy type (elliptical), and the lack of a coincident supernova, we suggest that there is now observational support for the hypothesis that short-hard bursts arise during the merger of a compact binary. We limit the properties of any Li-Paczyński "minisupernova" that is predicted to arise on ∼1 day timescales. Other progenitor models are still viable, and new Swift bursts will undoubtedly help to further clarify the progenitor picture. © 2006. The American Astronomical Society. All rights reserved.

Item Type: Article
Uncontrolled Keywords: 0201 Astronomical And Space Sciences, 0305 Organic Chemistry, 0306 Physical Chemistry (Incl. Structural)
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: American Astronomical Society
Date Deposited: 17 May 2017 11:31
Last Modified: 17 May 2017 11:31
DOI or Identification number: 10.1086/498107
URI: http://researchonline.ljmu.ac.uk/id/eprint/6453

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