Afterglow lightcurves from beamed outflows

Physics

Scientific paper

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Jets And Bursts, Galactic Winds And Fountains, Magnitudes And Colors, Luminosities, Gamma-Ray Sources, Gamma-Ray Bursts

Scientific paper

We study the dependence of relativistic outflow lightcurves on the initial parameters like the opening angle of the outflow, the initial bulk Lorentz factor, and varying the lateral flow velocity. To this end we use the numerical code by Moderski, Sikora, & Bulik (2000). We analyze the lightcurve of GRB 990510 and find that the data do not require a small opening angle of the outflow, θj>0.3 rad, while the initial bulk Lorentz factor must be above 30. .

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