LST-1 follow-up of the exceptionally bright gamma-ray burst GRB 221009A
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866915647135416320 |
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| author | Aguasca-Cabot, Arnau Carosi, Alessandro Donini, Alice Inoue, Susumu Sato, Yuri Arroyo, Monica Seglar Terauchi, Kenta Bordas, Pol Ribó, Marc |
| author_facet | Aguasca-Cabot, Arnau Carosi, Alessandro Donini, Alice Inoue, Susumu Sato, Yuri Arroyo, Monica Seglar Terauchi, Kenta Bordas, Pol Ribó, Marc |
| contents | On 9 October 2022, the brightest gamma-ray burst (GRB) ever recorded (GRB 221009A) was detected. Its remarkably bright emission, partially due to its close distance to Earth ($z\sim0.15$), makes this GRB a unique event. The outstanding characteristics of GRB 221009A, including the TeV detection by the LHAASO experiment, triggered deep follow-up observations of the source across all wavebands, including very-high-energy gamma rays with the first Large-Sized Telescope (LST-1) of the future Cherenkov Telescope Array Observatory. LST-1 observations started about one day after the onset of the prompt emission, under strong moonlight conditions. This resulted in a hint of a signal with a statistical significance of about 4$σ$. The monitoring of this source continued until the end of November 2022. This constitutes the deepest observation campaign performed on a GRB with LST-1. Here we show the results of this follow-up campaign. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2512_01747 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | LST-1 follow-up of the exceptionally bright gamma-ray burst GRB 221009A Aguasca-Cabot, Arnau Carosi, Alessandro Donini, Alice Inoue, Susumu Sato, Yuri Arroyo, Monica Seglar Terauchi, Kenta Bordas, Pol Ribó, Marc High Energy Astrophysical Phenomena On 9 October 2022, the brightest gamma-ray burst (GRB) ever recorded (GRB 221009A) was detected. Its remarkably bright emission, partially due to its close distance to Earth ($z\sim0.15$), makes this GRB a unique event. The outstanding characteristics of GRB 221009A, including the TeV detection by the LHAASO experiment, triggered deep follow-up observations of the source across all wavebands, including very-high-energy gamma rays with the first Large-Sized Telescope (LST-1) of the future Cherenkov Telescope Array Observatory. LST-1 observations started about one day after the onset of the prompt emission, under strong moonlight conditions. This resulted in a hint of a signal with a statistical significance of about 4$σ$. The monitoring of this source continued until the end of November 2022. This constitutes the deepest observation campaign performed on a GRB with LST-1. Here we show the results of this follow-up campaign. |
| title | LST-1 follow-up of the exceptionally bright gamma-ray burst GRB 221009A |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2512.01747 |