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Article Dans Une Revue Nature Astron. Année : 2023

Simultaneous Radio and Optical Polarimetry of GRB 191221B Afterglow

Yuji Urata
  • Fonction : Auteur
Kenji Toma
  • Fonction : Auteur
Stefano Covino
  • Fonction : Auteur
Klaas Wiersema
  • Fonction : Auteur
Kuiyun Huang
  • Fonction : Auteur
Jiro Shimoda
  • Fonction : Auteur
Asuka Kuwata
  • Fonction : Auteur
Sota Nagao
  • Fonction : Auteur
Keiichi Asada
  • Fonction : Auteur
Hiroshi Nagai
  • Fonction : Auteur
Satoko Takahashi
  • Fonction : Auteur
Chao En Chung
  • Fonction : Auteur
Glen Petitpas
  • Fonction : Auteur
Kazutaka Yamaoka
  • Fonction : Auteur
Luca Izzo
  • Fonction : Auteur
Johan Fynbo
  • Fonction : Auteur
Maryam Arabsalmani
  • Fonction : Auteur
Makoto Tashiro
  • Fonction : Auteur

Résumé

Gamma-ray bursts (GRBs) are the most luminous transients in the universe and are utilized as probes of early stars, gravitational wave counterparts, and collisionless shock physics. In spite of studies on polarimetry of GRBs in individual wavelengths that characterized intriguing properties of prompt emission and afterglow, no coordinated multi-wavelength measurements have yet been performed. Here, we report the first coordinated simultaneous polarimetry in the optical and radio bands for the afterglow associated with the typical long GRB 191221B. Our observations successfully caught the radio emission, which is not affected by synchrotron self-absorption, and show that the emission is depolarized in the radio band compared to the optical one. Our simultaneous polarization angle measurement and temporal polarization monitoring indicate the existence of cool electrons that increase the estimate of jet kinetic energy by a factor of $>$ 4 for this GRB afterglow. Further coordinated multi-wavelength polarimetric campaigns would improve our understanding of the total jet energies and magnetic field configurations in the emission regions of various types of GRBs, which are required to comprehend the mass scales of their progenitor systems and the physics of collisionless shocks.

Dates et versions

hal-03903585 , version 1 (16-12-2022)

Identifiants

Citer

Yuji Urata, Kenji Toma, Stefano Covino, Klaas Wiersema, Kuiyun Huang, et al.. Simultaneous Radio and Optical Polarimetry of GRB 191221B Afterglow. Nature Astron., 2023, 7 (1), pp.80-87. ⟨10.1038/s41550-022-01832-7⟩. ⟨hal-03903585⟩
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