Temporal properties of bright BGO GRBs detected by Fermi

TL;DR

This study analyzes the temporal properties of bright Fermi-detected GRBs across multiple energy bands, revealing a flatter duration-energy relationship at high energies, indicating closely linked emission mechanisms.

Contribution

It extends the duration-energy analysis of GRBs to higher energies up to 1 GeV, providing new insights into their emission mechanisms.

Findings

Flatter duration-energy relationship at high energies.

High- and low-energy emissions are closely related.

First analysis of this kind up to 1 GeV.

Abstract

We present results of an analysis of a sample of bright Gamma-Ray Bursts (GRBs) detected by Fermi-GBM up to more than 1 MeV, which were collected during six years of Fermi operations. In particular, we focus on the GRB durations over several energy bands of the prompt emission of a subsample of bright GRBs detected up to 10 MeV by GBM and, when possible, up to 1 GeV by Fermi-LAT, thus expanding the Duration-Energy relationship in GRB light curves to high energies for the first time. We find that the relationship for these energetic GRBs is flatter than reported for other samples, suggesting that the high- and low-energy emission mechanisms are closely related.