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A Jet Model for the Afterglow Emission from GRB000301C | | E. Berger
; R. Sari
; D. A. Frail
; S. R. Kulkarni
; F. Bertoldi
; A. Peck
; K. Menten
; D. S. Shepherd
; G. H. Moriarty-Schieven
; G. Pooley
; J. S. Bloom
; A. Diercks
; T. J. Galama
; K. Hurley
; | | Date: |
23 May 2000 | | Journal: | ApJ, 545, 56-62 (2000) | | Subject: | astro-ph | | Abstract: | We present broad-band radio observations of the afterglow of GRB000301C, spanning from 1.4 to 350 GHz for the period of 3 to 83 days after the burst. This radio data, in addition to measurements at 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 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, t_{jet}=7.5 days, we infer a jet opening angle of heta=0.2, and 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 imes 10^{51} ergs. | | Source: | arXiv, astro-ph/0005465 | | Services: | Forum | Review | PDF | Favorites | |
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