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1 results

  • Study of emission mechanism of GRBs probed by the gamma-ray polarization with IKAROS-GAP

  • Daisuke Yonetoku, Toshio Murakami, Tomonori Sakashita, Yoshiyuki Morihara, Shuichi Gunji, Tatehiro Mihara, Kenji Toma, GAP team
  • Journal:
    Proceedings of the International Astronomical Union / Volume 7 / Issue S279 / April 2011
    Published online by Cambridge University Press:
    05 September 2012, pp. 425-426
    Print publication:
    April 2011
    • Article
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  • We report a polarization measurement in prompt γ-ray emission of GRB 100826A with the Gamma-Ray Burst Polarimeter (GAP) aboard the small solar power sail demonstrator IKAROS. We detected a firm change of polarization angle (PA) during the prompt emission with 99.9% (3.5 σ) confidence level, and an average polarization degree (Π) of 27 ± 11% with 99.4% (2.9 σ) confidence level. Here the quoted errors are given at 1 σ confidence level for two parameters of interest. Non-axisymmetric (e.g., patchy) structures of the magnetic fields and/or brightness inside the relativistic jet are therefore required within the observable angular scale of ~ Γ−1. Our observation strongly indicates that the polarization measurement is a powerful tool to constrain the GRB production mechanism, and more theoretical works are needed to discuss the data in more details.