The Long-term Monitoring Results of Insight-HXMT in the First 4 yr Galactic Plane Scanning Survey

Abstract The first X-ray source catalog of the Insight-HXMT Galactic Plane (∣ b ∣ < 10°) Scanning Survey (GPSS) is presented based on data accumulated from 2017 June to 2021 August. 4 yr limit sensitivities at main energy bands can reach 8.2 × 10 −12 erg s −1 cm 2 (2−6 keV), 4.21 −11 (7−40 and 2.78 (25−100 keV). More than 1300 sources have been monitored a wide band (1−100 which 223 signal-to-noise ratio greater 5. We combined GPSS MAXI found it feasible obtain more complete long-term light curves their scanning results. flux variabilities different bright are analyzed excess variances. It that fluxes binaries active those supernova remnants isolated pulsars. Different types binaries, e.g., low-mass (LMXBs), high-mass (HMXBs), neutron star black hole also distinctively show regularities. In addition, relations between hardness (HR) variances, HR analyzed. obvious HRs HMXBs tend be harder LMXBs LMXBs.