Constraining Magnetization of Gamma-Ray Bursts Outflows using Prompt Emission Fluence

Abstract

I consider here acceleration and heating of relativistic outflow by local magnetic energy dissipation process in Poynting flux dominated outflow. Adopting the standard assumption that the reconnection rate scales with the Alfven speed, I show here that the fraction of energy dissipated as thermal photons cannot exceed (13 $\hat{\gamma }-14{)}^{-1}=30$% (for adiabatic index $\hat{\gamma }=4/3$) of the kinetic energy at the photosphere. Even in the most radiatively efficient scenario, the energy released as non-thermal photons during the prompt phase is at most equal to the kinetic energy of the outflow. These results imply that calorimetry of the kinetic energy that can be done during the afterglow phase, could be used to constrain the magnetization of gamma-ray bursts (GRB) outflows. I discuss the recent observational status, and its implications on constraining the magnetization in GRB outflows.

(Very) extensive discussions about current observational constraints, implications and limitations. Accepted for publication in the Astrophysical Journal

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Cited by in corpus (6)

• On the magnetisation and the radiative efficiency of BL Lac jets
• Radiative striped wind model for gamma-ray bursts
• GRB Spectrum from Gradual Dissipation in a Magnetized Outflow
• High time resolution search for prompt radio emission from the long GRB 210419A with the Murchison Widefield Array
• Plasmas in Gamma-Ray Bursts: particle acceleration, magnetic fields, radiative Processes and environments
• Connecting the early afterglow to the prompt GRB and the central engine in the striped jet model