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Kumar, H, Gupta, R, Saraogi, D, Ahumada, T, Andreoni, I, Anupama, GC, Aryan, A, Barway, S, Bhalerao, V, Chandra, P, Coughlin, MW, Dimple, D, Dutta, A, Ghosh, A, Ho, AYQ, Kool, EC, Kumar, A, Medford, MS, Misra, K, Pandey, SB , Perley, DA, Riddle, R, Ror, AK, Setiadi, JM and Yao, Y (2022) The long-active afterglow of GRB 210204A: detection of the most delayed flares in a gamma-ray burst. Monthly Notices of the Royal Astronomical Society, 513 (2). pp. 2777-2793. ISSN 0035-8711
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The long-active afterglow of GRB 210204A - detection of the most delayed flares in a gamma-ray burst.pdf - Published Version Download (6MB) | Preview |
Abstract
We present results from extensive broadband follow-up of GRB 210204A over the period of 30 d. We detect optical flares in the afterglow at 7.6 × 105 s and 1.1 × 106 s after the burst: the most delayed flaring ever detected in a GRB afterglow. At the source redshift of 0.876, the rest-frame delay is 5.8 × 105 s (6.71 d). We investigate possible causes for this flaring and conclude that the most likely cause is a refreshed shock in the jet. The prompt emission of the GRB is within the range of typical long bursts: it shows three disjoint emission episodes, which all follow the typical GRB correlations. This suggests that GRB 210204A might not have any special properties that caused late-time flaring, and the lack of such detections for other afterglows might be resulting from the paucity of late-time observations. Systematic late-time follow-up of a larger sample of GRBs can shed more light on such afterglow behaviour. Further analysis of the GRB 210204A shows that the late-time bump in the light curve is highly unlikely due to underlying SNe at redshift (z) = 0.876 and is more likely due to the late-time flaring activity. The cause of this variability is not clearly quantifiable due to the lack of multiband data at late-time constraints by bad weather conditions. The flare of GRB 210204A is the latest flare detected to date.
| Item Type: | Article |
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| Additional Information: | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2022 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
| Uncontrolled Keywords: | 0201 Astronomical and Space Sciences; Astronomy & Astrophysics |
| Subjects: | Q Science > QB Astronomy |
| Divisions: | Astrophysics Research Institute |
| Publisher: | Oxford University Press |
| SWORD Depositor: | A Symplectic |
| Date Deposited: | 15 Nov 2022 09:15 |
| Last Modified: | 15 Nov 2022 09:15 |
| DOI or ID number: | 10.1093/mnras/stac1061 |
| URI: | https://researchonline.ljmu.ac.uk/id/eprint/18122 |
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