2025ApJS..278...60X

As of 2023 December, the high-energy telescope (HE) of Insight-HXMT has detected 72 short-duration gamma-ray bursts (sGRBs), which may be related to binary compact star mergers. In this work, we locate these sGRBs by adopting an enhanced time-delay localization method based on the Li modified cross-correlation function (Li-CCF), jointly with Insight-HXMT/HE, Gravitational-wave high-energy Electromagnetic Counterpart All-sky Monitor, Fermi/Gamma-ray Burst Monitor (GBM), INTEGRAL/SPI-ACS, and Konus-Wind. The results indicate that joint localization improves accuracy (3σ) by an average of 59% compared to results with GBM alone, and the participation of HXMT improves the joint localization accuracy (3σ) by an average of 47%. The median and minimum of the joint localization area are 229 and 0.2 square degrees, respectively. We also propose a method to effectively locate those bursts (e.g., GRB 200415A) for which HE suffered from data saturation. In addition, we investigate whether the multiple annuli are independent when there is overlapping data through simulations. The results show that as long as the data from both satellites used have not been overlapped at the same time, the localization results (annuli) are independent. Finally, we verify the robustness of the results by comparing the precise localization bursts observed by Swift/Burst Alert Telescope, as well as publishing the high-time-resolution light curves, orbits and localization probability sky maps in Hierarchical Equal Area Isolatitude Pixelization format files on the website https://ihepbox.ihep.ac.cn/ihepbox/index.php/s/LO1eRZ0SBIEiBIg.