EDP Sciences
Free access
Volume 434, Number 2, May I 2005
Page(s) 623 - 627
Section Interstellar and circumstellar matter
DOI http://dx.doi.org/10.1051/0004-6361:20041359

A&A 434, 623-627 (2005)
DOI: 10.1051/0004-6361:20041359

The influence of jet geometry on light curves and spectra of GRB afterglows

A. G. Tolstov1, 2

1  Institute for Theoretical and Experimental Physics (ITEP), Bolshaya Cheremushkinskaya 25, 117218 Moscow, Russia
    e-mail: tolstov@mail.itep.ru
2  Max Plank Institute for Astrophysics(MPA), Karl-Schwarzschild-Str. 1, 85741 Garching, Germany
    e-mail: tolstov@mpa-garching.mpg.de

(Received 27 May 2004 / 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

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