The First Insight-HXMT Gamma-Ray Burst Catalog: The First Four Years

TL;DR

This paper presents the first four-year gamma-ray burst catalog from China's Insight-HXMT satellite, detailing 322 GRBs detected, their properties, and joint analyses with other missions to enhance understanding of high-energy astrophysical phenomena.

Contribution

It provides the first comprehensive catalog of GRBs detected by Insight-HXMT, including detailed properties and joint analyses with other major gamma-ray observatories, demonstrating HXMT's capabilities in high-energy astrophysics.

Findings

Detected 322 GRBs in four years of operation.

Insight-HXMT offers improved spectral constraints at higher energies.

The catalog includes detailed properties and joint analysis results of GRBs.

Abstract

The Hard X-ray Modulation Telescope (Insight-HXMT), is China's first X-ray astronomy satellite launched on June 15, 2017. The anti-coincidence CsI detectors of the High Energy X-ray telescope (HE) onboard Insight-HXMT could serve as an all-sky gamma-ray monitor in about 0.2-3 MeV. In its first four years of operation, Insight-HXMT has detected 322 Gamma-Ray Bursts (GRBs) by offline search pipeline including blind search and targeted search. For the GOLDEN sample of Insight-HXMT GRBs, joint analyses were performed with other GRB missions, including Fermi Gamma-ray Burst Monitor (Fermi/GBM), Swift Burst Alert Telescope (Swift/BAT) and Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor (GECAM). It shows that Insight-HXMT can provide better constraint on GRB spectrum at higher energy band. The properties of Insight-HXMT GRBs are reported in detail, including their trigger time, duration, spectral parameters, peak fluxes of different time scales and fluence. This catalog is an official product of the Insight-HXMT GRB team.