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de Wet, S, Laskar, T, Groot, PJ, Barniol Duran, R, Berger, E, Bhandari, S, Eftekhari, T, Guidorzi, C, Kobayashi, S, Perley, DA, Sari, R and Schroeder, G (2024) A Millimeter Rebrightening in GRB 210702A. Astrophysical Journal, 974. ISSN 0004-637X
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A Millimeter Rebrightening in GRB 210702A.pdf - Published Version Available under License Creative Commons Attribution. Download (1MB) | Preview |
Abstract
We present X-ray to radio frequency observations of the bright long gamma-ray burst GRB 210702A. Our Atacama Large Millimeter/submillimeter Array 97.5 GHz observations show a significant rebrightening by a factor of ≈2 beginning at 8.2 days post-burst and rising to peak brightness at 18.1 days before declining again. This is the first such rebrightening seen in a millimeter afterglow light curve. A standard forward shock model in a stellar wind circumburst medium can explain most of our X-ray, optical, and millimeter observations prior to the rebrightening, but significantly overpredicts the self-absorbed radio emission, and cannot explain the millimeter rebrightening. We investigate possible explanations for the millimeter rebrightening, and find that energy injection or a reverse shock from a late-time shell collision are plausible causes. Similar to other bursts, our radio data may require alternative scenarios such as a thermal electron population or a structured jet to explain the data. Our observations demonstrate that millimeter light curves can exhibit some of the rich features more commonly seen in optical and X-ray afterglow light curves, motivating further millimeter wavelength studies of GRB afterglows.
| Item Type: | Article |
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| Uncontrolled Keywords: | 0201 Astronomical and Space Sciences; 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics; 0306 Physical Chemistry (incl. Structural); Astronomy & Astrophysics |
| Subjects: | Q Science > QB Astronomy Q Science > QC Physics |
| Divisions: | Astrophysics Research Institute |
| Publisher: | American Astronomical Society |
| SWORD Depositor: | A Symplectic |
| Date Deposited: | 13 Nov 2024 11:54 |
| Last Modified: | 13 Nov 2024 12:00 |
| DOI or ID number: | 10.3847/1538-4357/ad77bb |
| URI: | https://researchonline.ljmu.ac.uk/id/eprint/24753 |
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