GRB 000418: A Hidden Jet Revealed

  title={GRB 000418: A Hidden Jet Revealed},
  author={Edo Berger and Alan H. Diercks and Dale A. Frail and Shrinivas R. Kulkarni and Joshua S. Bloom and Re’em Sari and Jules P. Halpern and Nestor Mirabal and Gregory B. Taylor and Kevin Hurley and Guy G. Pooley and Kyle M. Becker and R. Mark Wagner and Donald M. Terndrup and Thomas S. Statler and Daniel R. Wik and Evgenii P Mazets and Thomas L. Cline},
  journal={The Astrophysical Journal},
  pages={556 - 561}
We report on optical, near-infrared, and centimeter radio observations of GRB 000418 that allow us to follow the evolution of the afterglow from 2 to 200 days after the γ-ray burst (GRB). In modeling these broadband data, we find that an isotropic explosion in a constant-density medium is unable to simultaneously fit both the radio and optical data. However, a jetlike outflow into either a constant density or wind-stratified medium with an opening angle of 10°-20° provides a good description of… 

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