MG15 - Talk detail

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The High Energy X-ray telescope (HE) onboard Insight-HXMT (Hard X-ray Modulation Telescope), the first Chinese X-ray space telescope launched on June 15, 2017, is primary designed to observe the hard X-ray sky from its narrow Field of View (~6 deg) defined by the collimators. However, thanks to the innovative usage of the anticoincidence detector, HE has been extended to monitor GRBs and GW EM counterparts, making it one of the most large gamma-ray monitors in the multi-messenger gravitational wave astronomy era. HE features a very large collection area (~1000 cm2), moderate localization accuracy (~5 deg) and microsecond time resolution in 0.2-5 MeV. As of May 1st, 2018, Insight-HXMT/HE has detected more than 85 GRBs, including several short hard ones which were solely detected by it. During the observation of the first binary neutron star merger (GW170817), Insight-HXMT/HE monitored the entire GW localization area throughout the trigger time. Although Insight-HXMT did not detect any significant high energy (0.2-5 MeV) radiation from GW170817, its observation helped to confirm the unexpected weak and soft nature of GRB 170817A. Meanwhile, Insight-HXMT/HE provides one of the most stringent constraints (~10-7 to 10-6 erg/cm2/s) for both GRB170817A and any other possible precursor or extended emissions in 0.2-5 MeV, which help us to better understand the properties of EM radiation from this BNS merger.

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