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An early peak in the radio light curve of short-duration gamma-ray burst 200826A

Rhodes, Lauren and Fender, Rob and Williams, David R. A. and Mooley, Kunal (2021) An early peak in the radio light curve of short-duration gamma-ray burst 200826A. Monthly Notices of the Royal Astronomical Society, 503 (2). pp. 2966-2972. ISSN 0035-8711.

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We present the results of radio observations from the eMERLIN telescope combined with X-ray data from Swift for the short-duration gamma-ray burst (GRB) 200826A, located at a redshift of 0.71. The radio light curve shows evidence of a sharp rise, a peak around 4–5 d post-burst, followed by a relatively steep decline. We provide two possible interpretations based on the time at which the light curve reached its peak. (1) If the light curve peaks earlier, the peak is produced by the synchrotron self-absorption frequency moving through the radio band, resulting from the forward shock propagating into a wind medium and (2) if the light curve peaks later, the turnover in the light curve is caused by a jet break. In the former case we find a minimum equipartition energy of ∼3 × 10⁴⁷ erg and bulk Lorentz factor of ∼5, while in the latter case we estimate the jet opening angle of ∼9–16°. Due to the lack of data, it is impossible to determine which is the correct interpretation, however due to its relative simplicity and consistency with other multiwavelength observations which hint at the possibility that GRB 200826A is in fact a long GRB, we prefer the scenario one over scenario two.

Item Type:Article
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URLURL TypeDescription Paper
Fender, Rob0000-0002-5654-2744
Williams, David R. A.0000-0001-7361-0246
Mooley, Kunal0000-0002-2557-5180
Additional Information:© 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model ( Accepted 2021 March 2. Received 2021 February 12; in original form 2020 November 3. The authors would like to thank the referee for their helpful comments. LR acknowledges the support given by the Science and Technology Facilities Council through an STFC studentship. This work made use of data supplied by the UK Swift Science Data Centre at the University of Leicester. We acknowledge the Jodrell Bank Centre for Astrophysics. eMERLIN, funded by the STFC, is a National Facility operated by the University of Manchester at Jodrell Bank Observatory. DATA AVAILABILITY. The data presented in this paper are all available in the article.
Funding AgencyGrant Number
Science and Technology Facilities Council (STFC)UNSPECIFIED
Subject Keywords:gamma-ray burst: individual: GRB 200826A, radio continuum: transients
Issue or Number:2
Record Number:CaltechAUTHORS:20210526-160618285
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Official Citation:Lauren Rhodes, Rob Fender, David R A Williams, Kunal Mooley, An early peak in the radio light curve of short-duration gamma-ray burst 200826A, Monthly Notices of the Royal Astronomical Society, Volume 503, Issue 2, May 2021, Pages 2966–2972,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:109266
Deposited By: George Porter
Deposited On:27 May 2021 15:21
Last Modified:27 May 2021 15:21

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