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I highlight here some of the recent and most exciting observational and theoretical progress in understanding gamma-ray bursts. Observationally: (1) GRB221009A—the ‘brightest of all times’ (BOAT) GRB with TeV emission and the debate about the origin of this emission—leptonic (inverse Compton) or hadronic (proton-synchrotron); (2) GRB230307A: a long GRB originating from merger, which challenges GRB progenitor models; and (3) Polarization angle change observed, which does not have a convincing theoretical explanation. Theoretically, I discuss (4) The realization that GRB jets are structured, and its observational consequences; (5) Novel ways of explaining a power law spectra by photon energy gain, without the need for particle acceleration; and (6) New ideas about the origin of the “plateau” phase, and the possibility of GRB jet Lorentz factor of a few tens.

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Recent Observational and Theoretical Progress in the Study of Gamma-Ray Bursts

  • 会议论文

  • 发表日期：

    2025年

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  • Asaf Pe’er

摘要

I highlight here some of the recent and most exciting observational and theoretical progress in understanding gamma-ray bursts. Observationally: (1) GRB221009A—the ‘brightest of all times’ (BOAT) GRB with TeV emission and the debate about the origin of this emission—leptonic (inverse Compton) or hadronic (proton-synchrotron); (2) GRB230307A: a long GRB originating from merger, which challenges GRB progenitor models; and (3) Polarization angle change observed, which does not have a convincing theoretical explanation. Theoretically, I discuss (4) The realization that GRB jets are structured, and its observational consequences; (5) Novel ways of explaining a power law spectra by photon energy gain, without the need for particle acceleration; and (6) New ideas about the origin of the “plateau” phase, and the possibility of GRB jet Lorentz factor of a few tens.