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The properties of GRB 120923A at a spectroscopic redshift of z ≈ 7.8

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Tanvir, N. R., Laskar, T., Levan, Andrew J., Perley, D. A., Zabl, J., Fynbo, J. P. U., Rhoads, J., Cenko, S. B., Greiner, J., Wiersema, Klaas et al.
(2018) The properties of GRB 120923A at a spectroscopic redshift of z ≈ 7.8. The Astrophysical Journal, 865 (2). 107. doi:10.3847/1538-4357/aadba9 ISSN 0004-637X.

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Official URL: http://dx.doi.org/10.3847/1538-4357/aadba9

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Abstract

Gamma-ray bursts (GRBs) are powerful probes of early stars and galaxies, during and potentially even before the era of reionization. Although the number of GRBs identified at z 6 remains small, they provide a unique window on typical star-forming galaxies at that time, and thus are complementary to deep field observations. We report the identification of the optical drop-out afterglow of Swift GRB 120923A in near-infrared Gemini-North imaging, and derive a redshift of from Very Large Telescope/X-shooter spectroscopy. At this redshift the peak 15–150 keV luminosity of the burst was 3.2 × 1052 erg s−1, and in this sense it was a rather typical long-duration GRB in terms of rest frame luminosity. This burst was close to the Swift/Burst Alert Telescope detection threshold, and the X-ray and near-infrared afterglow were also faint. We present ground- and space-based follow-up observations spanning from X-ray to radio, and find that a standard external shock model with a constant-density circumburst environment of density n ≈ 4 × 10−2 cm−3 gives a good fit to the data. The near-infrared light curve exhibits a sharp break at t ≈ 3.4 days in the observer frame which, if interpreted as being due to a jet, corresponds to an opening angle of . The beaming-corrected γ-ray energy is then erg, while the beaming-corrected kinetic energy is lower, erg, suggesting that GRB 120923A was a comparatively low kinetic energy event. We discuss the implications of this event for our understanding of the high-redshift population of GRBs and their identification.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): Gamma ray bursts, Red shift
Journal or Publication Title: The Astrophysical Journal
Publisher: Institute of Physics Publishing, Inc.
ISSN: 0004-637X
Official Date: 1 October 2018
Dates:
DateEvent
1 October 2018Published
27 September 2018Available
16 August 2018Accepted
Volume: 865
Number: 2
Article Number: 107
DOI: 10.3847/1538-4357/aadba9
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Date of first compliant deposit: 23 October 2018
Date of first compliant Open Access: 23 October 2018
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
NAS 5-26555[NASA] National Aeronautics and Space Administrationhttp://dx.doi.org/10.13039/100000104
GO12558[NASA] National Aeronautics and Space Administrationhttp://dx.doi.org/10.13039/100000104
089.A-0067European Southern Observatoryhttp://dx.doi.org/10.13039/501100004604
UNSPECIFIEDNational Science Foundationhttp://dx.doi.org/10.13039/100000001
UNSPECIFIED[NRC] National Research Council Canadahttp://dx.doi.org/10.13039/501100000046
UNSPECIFIED[CONICYT] Comisión Nacional de Investigación Científica y Tecnológicahttp://dx.doi.org/10.13039/501100002848
UNSPECIFIED[ARC] Australian Research Councilhttp://dx.doi.org/10.13039/501100000923
UNSPECIFIEDMinistério da Ciência, Tecnologia e Inovaçãohttp://dx.doi.org/10.13039/501100003545
UNSPECIFIEDMinisterio de Ciencia, Tecnología e Innovación Productivahttp://dx.doi.org/10.13039/501100003033
UNSPECIFIEDAssociated Universities, Inc.http://viaf.org/viaf/134877607
ST/L000733/1[STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
UNSPECIFIEDDanmarks Grundforskningsfondhttp://dx.doi.org/10.13039/501100001732
EGGS-278202Seventh Framework Programmehttp://dx.doi.org/10.13039/100011102
UNSPECIFIEDCenter for Danish AstrophysicsUNSPECIFIED
Ramon y Cajal Fellowship[MINECO] Ministerio de Economía y Competitividadhttp://dx.doi.org/10.13039/501100003329
UNSPECIFIEDFundación BBVAhttp://dx.doi.org/10.13039/100007406
AYA 2014-58381-PSpain. GovernmentUNSPECIFIED
XDB23000000[CAS] Chinese Academy of Scienceshttp://dx.doi.org/10.13039/501100002367
11533003[NSFC] National Natural Science Foundation of Chinahttp://dx.doi.org/10.13039/501100001809
Sofja Kovalevskaja AwardAlexander von Humboldt-Stiftunghttp://dx.doi.org/10.13039/100005156
UNSPECIFIEDTLS TautenburgUNSPECIFIED
ST/N000757/1[STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271

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