Characterization of the GRB prompt fundamental plane using Fermi-GBM data

TL;DR

This paper analyzes the fundamental plane relation in gamma-ray bursts using Fermi-GBM data, quantifying its tightness and exploring different time scales for peak flux measurement.

Contribution

It provides a quantitative characterization of the fundamental plane relation in GRBs, including scatter measurement and analysis across multiple time scales.

Findings

Scatter in the fundamental plane is approximately 0.16-0.17 dex.

The relation holds across different peak flux time scales (64 ms, 256 ms, 1024 ms).

Incorporates uncertainties and uses PCA and regression analyses.

Abstract

A recent work has found a tight global relation between the GRB prompt fluence, peak flux (based on the optimum time scale determined from the Bayesian Blocks-based analysis) and duration using data from the Fermi Gamma-Ray burst monitor, which they have dubbed as "Fundamental Plane". We quantitatively characterize the tightness of this Fundamental Plane relation by calculating the scatter in dex. We also check for a fundamental plane using the peak flux over time scales of 64 ms, 256 ms and 1024 ms. For our analysis, we incorporate the uncertainties in the above observables and carried out both a PCA as well as regression-based analysis. We find that the scatter in the fundamental plane is 0.16-0.17 dex.