Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-10-12
Astrophys.J. 554 (2001) 667-678
Astronomy and Astrophysics
Astrophysics
accepted for publication by the ApJ, vol. 554. 11 pages, color figures. Last figures replaced with probability distributions o
Scientific paper
10.1086/321388
We model the radio, optical, and X-ray emission for the afterglows of GRB 980703, 990123, 990510, and 991216, within the framework of relativistic jets, to determine their physical parameters. The models that yield acceptable fits to the data have jet energies mostly between 10^{50} to 10^{51} erg and initial opening angles between 1 deg and 4 deg. The external medium density is uncertain by at least one order of magnitude in each case, being around 10^{-3}/cm^3 for GRB 980703 and 990123, ~0.1/cm^3 for GRB 990510, and ~3/cm^3 for GRB 991216. If the jets are uniform (i.e. there are no angular gradients of the energy per solid angle) then the 20 keV -- 1 MeV radiative efficiency during the GRB phase must have been at least 2-3% for GRB 990510, 20% for GRB 990123, and 30% for GRB 991216.
Kumar Pawan
Panaitescu Alin
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