GRB1 - Inner Engine: Symmetries and Spectra of Short GRBs |
Speaker_ |
Bianco, Carlo Luciano |
Co-autors |
Maria Grazia Bernardini, Pascal Chardonnet, Federico Fraschetti, Remo Ruffini, She-Sheng Xue |
Talk _ |
Theoretical interpretation of luminosity and spectral properties of GRB 031203 |
Abstract _ |
The X and gamma-ray observations of the source GRB 031203 by INTEGRAL are interpreted within our theoretical model. We specifically assume that the afterglow emission originates from a thermal spectrum in the co-moving frame of the expanding baryonic matter shell. By determining the two free parameters of the model and estimating the density and filamentary structure of the ISM, we reproduce the observed luminosity in the 20-200 keV energy band. As in previous sources, the prompt radiation is shown to coincide with the peak of the afterglow and the luminosity substructure are shown to originate in the filamentary structure of the ISM. We predict a clear hard-to-soft behavior in the instantaneous spectra. The time-integrated spectrum over 20 seconds observed by INTEGRAL is well fitted. Also, a possible interpretation of the connection between GRB 031203 and SN 2003lw will be outlined. |