A jet model for the afterglow emission from GRB 000301C

E. Berger*, R. Sari, D. A. Frail, S. R. Kulkarni, F. Bertoldi, A. B. Peck, K. M. Menten, D. S. Shepherd, G. H. Moriarty-Schieven, G. Pooley, J. S. Bloom, A. Diercks, T. J. Galama, K. Hurley

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

73 Scopus citations


We present broadband radio observations of the afterglow of GRB 000301C, spanning from 1.4 to 350 GHz for the period of 3-130 days after the burst. These radio data, in addition to measurements in the optical bands, suggest that the afterglow arises from a collimated outflow, i.e., a jet. To test this hypothesis in a self-consistent manner, we employ a global fit and find that a model of a jet expanding into a constant-density interstellar medium (ISM + jet) provides the best fit to the data. A model of the burst occurring in a wind-shaped circumburst medium (wind-only model) can be ruled out, and a wind + jet model provides a much poorer fit of the optical/IR data than the ISM + jet model. In addition, we present the first clear indication that the reported fluctuations in the optical/IR are achromatic, with similar amplitudes in all bands, and possibly extend into the radio regime. Using the parameters derived from the global fit, in particular a jet break time tjet ≈ 7.3 days, we infer a jet opening angle of θ0 0.2 rad; consequently, the estimate of the emitted energy in the GRB itself is reduced by a factor of 50 relative to the isotropic value, giving E ≈ 1.1 × 1051 ergs.

Original languageAmerican English
Pages (from-to)56-62
Number of pages7
JournalAstrophysical Journal
Issue number1 PART 1
StatePublished - 10 Dec 2000
Externally publishedYes


  • Cosmology: observations
  • Gamma rays: bursts
  • Radio continuum: general


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