A millimeter rebrightening in GRB 210702A
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arXiv
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| Format: | Preprint |
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2024
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| author | de Wet, Simon Laskar, Tanmoy Groot, Paul J. Duran, Rodolfo Barniol Berger, Edo Bhandari, Shivani Eftekhari, Tarraneh Guidorzi, C. Kobayashi, Shiho Perley, Daniel A. Sari, Re'em Schroeder, Genevieve |
| author_facet | de Wet, Simon Laskar, Tanmoy Groot, Paul J. Duran, Rodolfo Barniol Berger, Edo Bhandari, Shivani Eftekhari, Tarraneh Guidorzi, C. Kobayashi, Shiho Perley, Daniel A. Sari, Re'em Schroeder, Genevieve |
| contents | We present X-ray to radio frequency observations of the bright long gamma-ray burst GRB 210702A. Our ALMA 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 over-predicts 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_14641 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | A millimeter rebrightening in GRB 210702A de Wet, Simon Laskar, Tanmoy Groot, Paul J. Duran, Rodolfo Barniol Berger, Edo Bhandari, Shivani Eftekhari, Tarraneh Guidorzi, C. Kobayashi, Shiho Perley, Daniel A. Sari, Re'em Schroeder, Genevieve High Energy Astrophysical Phenomena We present X-ray to radio frequency observations of the bright long gamma-ray burst GRB 210702A. Our ALMA 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 over-predicts 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. |
| title | A millimeter rebrightening in GRB 210702A |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2408.14641 |