Screening High-z GRBs with BAT Prompt Emission Properties

TL;DR

This paper develops criteria based on BAT prompt emission properties to efficiently identify high-redshift gamma-ray bursts, aiding rapid alerts and studies of the early universe.

Contribution

It introduces new screening criteria for high-z GRBs using BAT spectral and temporal data, improving detection speed and accuracy.

Findings

Red-shift correlates with T90, variance, peak flux, and photon index.

Constructed criteria enable faster high-z GRB identification.

Facilitates early universe studies through rapid high-z GRB detection.

Abstract

Detecting high-z GRBs is important for constraining the GRB formation rate, and tracing the history of re-ionization and metallicity of the universe. Based on the current sample of GRBs detected by Swift with known redshifts, we investigated the relationship between red-shift, and spectral and temporal characteristics, using the BAT event-by-event data. We found red-shift trends for the peak-flux-normalized temporal width T90, the light curve variance, the peak flux, and the photon index in simple power-law fit to the BAT event data. We have constructed criteria for screening GRBs with high red-shifts. This will enable us to provide a much faster alert to the GRB community of possible high-z bursts.