An optical-ultraviolet flare with absolute AB magnitude of -39.4 detected in GRB 220101A
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arXiv
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| Format: | Preprint |
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2023
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| _version_ | 1866911903933005824 |
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| author | Jin, Zhi-Ping Zhou, Hao Wang, Yun Geng, Jin-Jun Covino, Stefano Wu, Xue-Feng Li, Xiang Fan, Yi-Zhong Wei, Da-Ming Wei, Jian-Yan |
| author_facet | Jin, Zhi-Ping Zhou, Hao Wang, Yun Geng, Jin-Jun Covino, Stefano Wu, Xue-Feng Li, Xiang Fan, Yi-Zhong Wei, Da-Ming Wei, Jian-Yan |
| contents | Hyperluminous optical-ultraviolet fares have been detected in gamma-ray bursts and the luminosity record was held by naked-eye event GRB 080319B. Such fares are widely attributed to internal shock or external reverse shock radiation. Here, with a new method developed to derive reliable photometry from saturated sources of Swift/UVOT, we carry out time-resolved analysis of the initial white-band 150s exposure of GRB 220101A, a burst at a redshift of 4.618, and report a rapidly evolving optical-ultraviolet fare with a high absolute AB magnitude of -39.4$\pm$0.2. In contrast to GRB 080319B, the temporal behaviour of this new fare does not trace the gamma-ray activity. Instead of either internal shocks or reverse shock, this extremely energetic optical-ultraviolet fare is most likely to originate from the refreshed shocks induced by the late-ejected extremely energetic material catching up with the earlier-launched decelerating outflow. This finding reveals the diverse origins of the extremely energetic optical-ultraviolet fares and demonstrates the necessity of high-time-resolution observations at early times. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2301_02407 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | An optical-ultraviolet flare with absolute AB magnitude of -39.4 detected in GRB 220101A Jin, Zhi-Ping Zhou, Hao Wang, Yun Geng, Jin-Jun Covino, Stefano Wu, Xue-Feng Li, Xiang Fan, Yi-Zhong Wei, Da-Ming Wei, Jian-Yan High Energy Astrophysical Phenomena Hyperluminous optical-ultraviolet fares have been detected in gamma-ray bursts and the luminosity record was held by naked-eye event GRB 080319B. Such fares are widely attributed to internal shock or external reverse shock radiation. Here, with a new method developed to derive reliable photometry from saturated sources of Swift/UVOT, we carry out time-resolved analysis of the initial white-band 150s exposure of GRB 220101A, a burst at a redshift of 4.618, and report a rapidly evolving optical-ultraviolet fare with a high absolute AB magnitude of -39.4$\pm$0.2. In contrast to GRB 080319B, the temporal behaviour of this new fare does not trace the gamma-ray activity. Instead of either internal shocks or reverse shock, this extremely energetic optical-ultraviolet fare is most likely to originate from the refreshed shocks induced by the late-ejected extremely energetic material catching up with the earlier-launched decelerating outflow. This finding reveals the diverse origins of the extremely energetic optical-ultraviolet fares and demonstrates the necessity of high-time-resolution observations at early times. |
| title | An optical-ultraviolet flare with absolute AB magnitude of -39.4 detected in GRB 220101A |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2301.02407 |