This means that during these intervals, the emission is either emitted close to the saturation radius or in a flow which is laminar. The results further indicate that dissipation below the photosphere is responsible for the spectral shape in a majority of GRB spectra. It is consequently argued that the dominant emission mechanism during the prompt emission phase in GRBs is thermal emission from the jet photosphere at distance of around 1012 cm from the central engine. A small percentage of the bursts are better explained with a non-thermal generating process such as the synchrotron emission.
