GRB 161117A: Transition from Thermal to Non-Thermal Emission
Analysis
This paper analyzes the spectral evolution of GRB 161117A, a long-duration gamma-ray burst, revealing a transition from thermal to non-thermal emission. This transition provides insights into the jet composition, suggesting a shift from a fireball to a Poynting-flux-dominated jet. The study infers key parameters like the bulk Lorentz factor, radii, magnetization factor, and dimensionless entropy, offering valuable constraints on the physical processes within the burst. The findings contribute to our understanding of the central engine and particle acceleration mechanisms in GRBs.
Key Takeaways
- •GRB 161117A exhibits a transition in emission type, from thermal to non-thermal.
- •This transition suggests a change in the jet composition, from a fireball to a Poynting-flux-dominated jet.
- •The study infers key physical parameters like Lorentz factor and magnetization.
- •The findings provide insights into the central engine and particle acceleration mechanisms in GRBs.
Reference
“The spectral evolution shows a transition from thermal (single BB) to hybrid (PL+BB), and finally to non-thermal (Band and CPL) emissions.”