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Title:
GRB090426: the environment of a rest-frame 0.35-s gamma-ray burst at a redshift of 2.609
Authors:
Levesque, Emily M.; Bloom, Joshua S.; Butler, Nathaniel R.; Perley, Daniel A.; Cenko, S. Bradley; Prochaska, J. Xavier; Kewley, Lisa J.; Bunker, Andrew; Chen, Hsiao-Wen; Chornock, Ryan; Filippenko, Alexei V.; Glazebrook, Karl; Lopez, Sebastian; Masiero, Joseph; Modjaz, Maryam; Morgan, Adam; Poznanski, Dovi
Affiliation:
AA(Institute for Astronomy, University of Hawaii, 2680 Woodlawn Dr., Honolulu, HI 96822, USA; Smithsonian Astrophysical Observatory, 60 Garden St., Cambridge, MA 02139, USA), AB(Department of Astronomy, 601 Campbell Hall, University of California, Berkeley, CA 94720-3411, USA), AC(Department of Astronomy, 601 Campbell Hall, University of California, Berkeley, CA 94720-3411, USA), AD(Department of Astronomy, 601 Campbell Hall, University of California, Berkeley, CA 94720-3411, USA), AE(Department of Astronomy, 601 Campbell Hall, University of California, Berkeley, CA 94720-3411, USA), AF(Department of Astronomy and Astrophysics, UCO/Lick Observatory, University of California, 1156 High Street, Santa Cruz, CA 95064, USA), AG(Institute for Astronomy, University of Hawaii, 2680 Woodlawn Dr., Honolulu, HI 96822, USA), AH(Department of Astrophysics, Oxford University, Keble Road, Oxford OX1 3RH), AI(Department of Astronomy & Astrophysics, University of Chicago, Chicago, IL 60637, USA), AJ(Department of Astronomy, 601 Campbell Hall, University of California, Berkeley, CA 94720-3411, USA), AK(Department of Astronomy, 601 Campbell Hall, University of California, Berkeley, CA 94720-3411, USA), AL(Centre for Astrophysics and Supercomputing, Swinburne University of Technology, PO Box 218, Hawthorn, VIC 3122, Australia), AM(Departamento de Astronomia, Universidad de Chile, Casilla 36-D, Santiago, Chile), AN(Institute for Astronomy, University of Hawaii, 2680 Woodlawn Dr., Honolulu, HI 96822, USA), AO(Department of Astronomy, 601 Campbell Hall, University of California, Berkeley, CA 94720-3411, USA), AP(Department of Astronomy, 601 Campbell Hall, University of California, Berkeley, CA 94720-3411, USA), AQ(Department of Astronomy, 601 Campbell Hall, University of California, Berkeley, CA 94720-3411, USA)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 401, Issue 2, pp. 963-972. (MNRAS Homepage)
Publication Date:
01/2010
Origin:
MNRAS
MNRAS Keywords:
galaxies: ISM, gamma-rays: bursts
Abstract Copyright:
(c) Journal compilation © 2010 RAS
DOI:
10.1111/j.1365-2966.2009.15733.x
Bibliographic Code:
2010MNRAS.401..963L

Abstract

ABSTRACT We present the discovery of an absorption-line redshift of z = 2.609 for GRB090426, establishing the first firm lower limit to a redshift for a gamma-ray burst (GRB) with an observed duration of <2s. With a rest-frame burst duration of T90z = 0.35s 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 HI column density sightline, with NHI < 3.2 × 1019cm-2. Our GRB090426 afterglow spectrum also appears to have weaker low-ionization absorption (SiII, CII) 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.
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