Probing the Emission Sites of GRBs
  I present a computationally efficient way to account for synchrotron and its inverse Compton scattered emission along with the resulting radiative losses, in a self-consistent way, for a relativistic distribution of electrons continuously injected in an expanding region. This approach permits the exploration of the wide parameter space of the physical processes in a shock. I apply it to the picture of ``internal shocks'' for the description of Gamma Ray Bursts. I use the properties of the time-integrated spectra as defined mainly by observations by BATSE, EGRET, and Ginga to impose constrains on the parameter space. I discuss the corresponding shock properties and one of the ways in which INTEGRAL can provide further insight. 
H. Papathanassiou (SISSA)