Volume 434, Number 2, May I 2005
|Page(s)||623 - 627|
|Section||Interstellar and circumstellar matter|
|Published online||11 April 2005|
The influence of jet geometry on light curves and spectra of GRB afterglows
Institute for Theoretical and Experimental Physics (ITEP), Bolshaya Cheremushkinskaya 25, 117218 Moscow, Russia e-mail: email@example.com
2 Max Plank Institute for Astrophysics(MPA), Karl-Schwarzschild-Str. 1, 85741 Garching, Germany e-mail: firstname.lastname@example.org
Accepted: 4 January 2005
We have performed detailed calculations of spectra and light curves of GRB afterglows assuming that the observed GRBs can have a jet geometry. The calculations are based on an expanding relativistic shock GRB afterglow model where the afterglow is the result of synchrotron radiation of relativistic electrons with power-law energy distribution at the front of external shock being decelerated in a circumstellar medium. To determine the intensity on the radiation surface we numerically solve the full time-, angle- and frequency-dependent special relativistic transfer equation in the comoving frame using the method of long characteristics.
Key words: gamma rays: bursts / ISM: jets and outflows / radiative transfer
© ESO, 2005
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