An optical-ultraviolet flare with absolute AB magnitude of -39.4 detected in GRB 220101A

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 fr...

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Bibliographic Details
Published in:arXiv.org 2024-06
Main Authors: Zhi-Ping Jin, Zhou, Hao, Wang, Yun, Jin-Jun, Geng, Covino, Stefano, Xue-Feng, Wu, Li, Xiang, Yi-Zhong, Fan, Da-Ming, Wei, Jian-Yan, Wei
Format: Article
Language:English
Subjects:
Deceleration
Energetic materials
Flares
Gamma ray bursts
Gamma rays
Red shift
Online Access:Get full text
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Summary: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.
ISSN:2331-8422
DOI:10.48550/arxiv.2301.02407