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Spectropolarimetry and photometry of the early afterglow of the gamma-ray burst GRB 191221B
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(2021) Spectropolarimetry and photometry of the early afterglow of the gamma-ray burst GRB 191221B. Monthly Notices of the Royal Astronomical Society, 506 (3). pp. 4621-4631. doi:10.1093/mnras/stab1791 ISSN 0035-8711.
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Official URL: http://dx.doi.org/10.1093/mnras/stab1791
Abstract
We report on results of spectropolarimetry of the afterglow of the long gamma-ray burst GRB 191221B, obtained with SALT/RSS and VLT/FORS2, as well as photometry from two telescopes in the MASTER Global Robotic Network, at the MASTER-SAAO (South Africa) and MASTER-OAFA (Argentina) stations. Prompt optical emission was detected by MASTER-SAAO 38 s after the alert, which dimmed from a magnitude (white-light) of ∼10–16.2 mag over a period of ∼10 ks, followed by a plateau phase lasting ∼10 ks and then a decline to ∼18 mag after 80 ks. The light curve shows complex structure, with four or five distinct breaks in the power-law decline rate. SALT/RSS linear spectropolarimetry of the afterglow began ∼2.9 h after the burst, during the early part of the plateau phase of the light curve. Absorption lines seen at ∼6010 and 5490 Å are identified with the Mg ii 2799 Å line from the host galaxy at z = 1.15 and an intervening system located at z = 0.96. The mean linear polarization measured over 3400–8000 Å was ∼1.5 per cent and the mean equatorial position angle (θ) was ∼65°. VLT/FORS2 spectropolarimetry was obtained ∼10 h post-burst, during a period of slow decline (α = −0.44), and the polarization was measured to be p = 1.2 per cent and θ = 60°. Two observations with the MeerKAT radio telescope, taken 30 and 444 d after the GRB trigger, detected radio emission from the host galaxy only. We interpret the light curve and polarization of this long GRB in terms of a slow-cooling forward shock.
Item Type: | Journal Article | |||||||||||||||||||||||||||
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Subjects: | Q Science > QB Astronomy Q Science > QC Physics |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||||||||||||||||||||
Library of Congress Subject Headings (LCSH): | Gamma ray bursts , Polarimetry , Astrophysical spectropolarimetry , Light curves , Polarization (Light) | |||||||||||||||||||||||||||
Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | |||||||||||||||||||||||||||
Publisher: | Wiley | |||||||||||||||||||||||||||
ISSN: | 0035-8711 | |||||||||||||||||||||||||||
Official Date: | September 2021 | |||||||||||||||||||||||||||
Dates: |
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Volume: | 506 | |||||||||||||||||||||||||||
Number: | 3 | |||||||||||||||||||||||||||
Page Range: | pp. 4621-4631 | |||||||||||||||||||||||||||
DOI: | 10.1093/mnras/stab1791 | |||||||||||||||||||||||||||
Status: | Peer Reviewed | |||||||||||||||||||||||||||
Publication Status: | Published | |||||||||||||||||||||||||||
Reuse Statement (publisher, data, author rights): | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society All rights reserved. | |||||||||||||||||||||||||||
Access rights to Published version: | Restricted or Subscription Access | |||||||||||||||||||||||||||
Date of first compliant deposit: | 29 November 2021 | |||||||||||||||||||||||||||
Date of first compliant Open Access: | 2 December 2021 | |||||||||||||||||||||||||||
RIOXX Funder/Project Grant: |
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