Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-08-18
Nuovo Cim.C28:467-470,2005
Astronomy and Astrophysics
Astrophysics
4 pages, 1 figure, to appear Il Nuovo Cimento, proceedings of the 4th Workshop Gamma-Ray Bursts in the Afterglow Era, Rome, 18
Scientific paper
10.1393/ncc/i2005-10085-5
According to the fireball model gamma-ray burst (GRB) afterglows are the result of a shock pushed into the surrounding medium by an extremely relativistic outflow from the GRB. By modeling the broadband spectrum, ranging from X-ray to radio wavelengths, on time scales of hours to years after the GRB, we can determine several burst parameters, e.g. the burst energy, the circumburst medium density (and its gradient) and the energy contained in electrons and the magnetic field. We have developed a code to do broadband modeling and determine the model parameters. We also performed Monte Carlo simulations with synthetic data sets in order to derive an estimate of the accuracy of the best fit parameters. GRB970508 was taken as a case study and we present our fitting results. We also present our WSRT radio observations of GRB030329 at centimeter wavelengths and the results from modeling this afterglow. The low frequency WSRT radio observations provide a unique possibility to study the late stages of the fireball evolution and examine the jet structure.
der Horst Alexander J. van
Rol Evert
Wijers Ralph A. M. J.
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