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GRB 090426: The environment of a rest-frame 0.35-s gamma-ray burst at a redshift of 2.609

Levesque, EM and Bloom, JS and Butler, NR and Perley, DA and Cenko, SB and Prochaska, JX and Kewley, LJ and Bunker, A and Chen, HW and Chornock, R and Filippenko, AV and Glazebrook, K and Lopez, S and Masiero, J and Modjaz, M and Morgan, A and Poznanski, D (2010) GRB 090426: The environment of a rest-frame 0.35-s gamma-ray burst at a redshift of 2.609. Monthly Notices of the Royal Astronomical Society, 401 (2). pp. 963-972. ISSN 0035-8711

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Abstract

We present the discovery of an absorption-line redshift of z = 2.609 for GRB 090426, establishing the first firm lower limit to a redshift for a gamma-ray burst (GRB) with an observed duration of <2 s. With a rest-frame burst duration of T90z = 0.35 s and a detailed examination of the peak energy of the event, we suggest that this is likely (at >90 per cent confidence) a member of the short/hard phenomenological class of GRBs. From analysis of the optical-afterglow spectrum we find that the burst originated along a very low H i column density sightline, with NH i < 3.2 × 1019 cm-2. Our GRB 090426 afterglow spectrum also appears to have weaker low-ionization absorption (Si ii, C ii) than ∼95 per cent of previous afterglow spectra. Finally, we also report the discovery of a blue, very luminous, star-forming putative host galaxy (∼2L *) at a small angular offset from the location of the optical afterglow. We consider the implications of this unique GRB in the context of burst duration classification and our understanding of GRB progenitor scenarios. © 2009 RAS.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2009 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: 0201 Astronomical And Space Sciences
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Q Science > QD Chemistry
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Date Deposited: 24 May 2017 10:40
Last Modified: 09 Sep 2017 18:58
DOI or Identification number: 10.1111/j.1365-2966.2009.15733.x
URI: http://researchonline.ljmu.ac.uk/id/eprint/6573

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