Synchrotron Emissions in GRB Prompt Phase Using a Semi Leptonic and Hadronic Model

TL;DR

This paper explores how future observations of GRB prompt emissions can reveal magnetic field properties and particle acceleration mechanisms, potentially confirming the role of GRBs in ultra-high-energy cosmic ray production.

Contribution

It proposes that GLAST data can measure magnetic turbulence parameters in GRBs, constraining models and advancing understanding of particle acceleration and UHECR origins.

Findings

Peak energy law constrains turbulence spectrum to Kolmogorov scaling.

Data can improve understanding of electron and proton acceleration in GRBs.

Potential signatures of UHECRs through GeV-TeV synchrotron emission.

Abstract

In this communication devoted to the prompt emission of GRBs, we claim that some important parameters associated to the magnetic field, such as its index profile, the index of its turbulence spectrum and its level of irregularities, will be measurable with GLAST. In particular the law relating the peak energy Epeak with the total energy E (like Amati's law) constrains the turbulence spectrum index and, among all existing theories of MHD turbulence, is compatible with the Kolmogorov scaling only. Thus, these data will allow a much better determination of the performances of GRBs as particle accelerators. This opens the possibility to characterize both electron and proton acceleration more seriously. We discuss the possible generation of UHECRs and of its signature through GeV-TeV synchrotron emission.