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GRB 120521C ATz∼ 6 and the properties of high-redshift γ-ray bursts
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Laskar, Tanmoy, Berger, Edo, Tanvir, Nial, Zauderer, B. Ashley, Margutti, Raffaella, Levan, Andrew J., Perley, Daniel, Fong, Wen-fai, Wiersema, Klaas, Menten, Karl and Hrudkova, Marie (2013) GRB 120521C ATz∼ 6 and the properties of high-redshift γ-ray bursts. The Astrophysical Journal, Volume 781 (Number 1). Article number 1. doi:10.1088/0004-637X/781/1/1 ISSN 0004-637X.
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Official URL: http://dx.doi.org/10.1088/0004-637X/781/1/1
Abstract
We present optical, near-infrared, and radio observations of the afterglow of GRB 120521C. By modeling the multi-wavelength data set, we derive a photometric redshift of z ≈ 6.0, which we confirm with a low signal-to-noise ratio spectrum of the afterglow. We find that a model with a constant-density environment provides a good fit to the afterglow data, with an inferred density of n lsim 0.05 cm–3. The radio observations reveal the presence of a jet break at t jet ≈ 7 d, corresponding to a jet opening angle of θjet ≈ 3°. The beaming-corrected γ-ray and kinetic energies are E γ ≈ EK ≈ 3 × 1050 erg. We quantify the uncertainties in our results using a detailed Markov Chain Monte Carlo analysis, which allows us to uncover degeneracies between the physical parameters of the explosion. To compare GRB 120521C to other high-redshift bursts in a uniform manner we re-fit all available afterglow data for the two other bursts at z gsim 6 with radio detections (GRBs 050904 and 090423). We find a jet break at t jet ≈ 15 d for GRB 090423, in contrast to previous work. Based on these three events, we find that γ-ray bursts (GRBs) at z gsim 6 appear to explode in constant-density environments, and exhibit a wide range of energies and densities that span the range inferred for lower redshift bursts. On the other hand, we find a hint for narrower jets in the z gsim 6 bursts, potentially indicating a larger true event rate at these redshifts. Overall, our results indicate that long GRBs share a common progenitor population at least to z ~ 8.
Item Type: | Journal Article | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Journal or Publication Title: | The Astrophysical Journal | ||||
Publisher: | Institute of Physics Publishing, Inc. | ||||
ISSN: | 0004-637X | ||||
Official Date: | 2013 | ||||
Dates: |
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Volume: | Volume 781 | ||||
Number: | Number 1 | ||||
Page Range: | Article number 1 | ||||
DOI: | 10.1088/0004-637X/781/1/1 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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