Gamma Ray Burst Prompt Emission Variability in Synchrotron and Synchrotron Self-Compton Lightcurves

摘要

Gamma Ray Burst prompt emission is thought to have originated from electrons accelerated in internal shocks within a highly relativistic outflow. Radiation mechanism behind the bright gamma-ray emission is debated. Likely candidates include synchrotron and inverse Compton processes. In this paper, we develop a 'top-down' formalism by using observed quantities to infer physical parameters, and subsequently to study the temporal structure of synchrotron and synchrotron self-Compton components of a GRB. We find that the relative extent of small scale fluctuations differ in the two components. Small variations in the synchrotron lightcurve can be moderately amplified in the synchrotron self-Compton lightcurve. We apply our method to the bright naked-eye burst GRB080319B which has simultaneous optical and gamma-ray lightcurves with comparable time resolution. We find that for the reasonable parameter space explored, gamma-ray SSC lightcurve computed based on our analytical formalism is not as complex as the observed BAT lightcurve of GRB080319B.