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

Abstract

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.

Published in Nature Astronomy, the definitive version is available at https://www.nature.com/articles/s41550-023-02005-w

References in corpus (12)

• The Physics of Gamma-Ray Bursts and Relativistic Jets
• An online repository of Swift/XRT light curves of GRBs
• Paper II: Calibration of the Swift ultraviolet/optical telescope
• The very early afterglow powered by the ultra-relativistic mildly magnetized outflows
• Low-energy Spectra of Gamma-ray Bursts from Cooling Electrons
• The photospheric radiation model for the prompt emission of Gamma-ray Bursts: Interpreting four observed correlations
• The Swift-UVOT ultraviolet and visible grism calibration
• Prompt optical emission from residual collisions in GRB outflows
• The measurement errors in the Swift-UVOT and XMM-OM
• Naked-eye optical flash from GRB 080319B: Tracing the decaying neutrons in the outflow
• A Large Catalog of Homogeneous Ultra-Violet/Optical GRB Afterglows: Temporal and Spectral Evolution
• Constrains on the physics of the prompt emission from a distant and energetic gamma-ray burst GRB 220101A

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