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First Detection of Faraday Rotation in a Gamma-Ray Burst Afterglow: Low Polarization and High Rotation Measure in GRB 260310A Reveal the Jet's Magnetic Structure and Environment

  • Authors: Collin T. Christy, Tanmoy Laskar, Kate D. Alexander, Noah Franz, Jonathan Granot, Ryan Chornock, Raffaella Margutti, Ramandeep Gill, Jeniveve Pearson, Edo Berger, Wen-fai Fong, Coleman Rohde, Patricia Schady

Collin T. Christy et al 2026 The Astrophysical Journal Letters 1006 .

  • Provider: AAS Journals

Caption: Figure 2.

Stokes IQU and linear polarization intensity ﹩{P}_{L}=\sqrt{{Q}^{2}+{U}^{2}}﹩ of GRB 260310A at 19.2 days. The images reveal a strong polarized point source that fades at lower frequencies. Additionally, the QU images reveal a frequency-dependent rotation in the polarization angle.

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