AbstractWe consider the temporal behaviour and spectra of early X-ray afterglows of Gamma-Ray Bursts (GRBs) and identify peculiarities imprinted by dynamcal processes in GRB shocks. It is shown that the bolometric lightcurve may deviate from monotonous decline when the late-time energy injection takes place via a secondary shock. The latter is formed by a neutron component of outflow, which is present in any stellar-type GRB model and carry as much energy as the proton component. Kinetic processes in the emitting region give rise to a break in the spectrum of X-ray emission of synchrotron origin related to a break in the electron distribution function, which appears due to transition from synchrotron cooling (for the most energetic electrons) to Compton cooling (for less energetic ones). The new generation of X-ray missions with greatly enhanced sensitivity offers a breakthrough in understanding of dynamics of early GRB afterglows.


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    Titel :

    Lightcurves and spectral features of X-ray afterglows of gamma-ray bursts


    Beteiligte:

    Erschienen in:

    Advances in Space Research ; 32 , 10 ; 2039-2044


    Erscheinungsdatum :

    2003-01-01


    Format / Umfang :

    6 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



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