GRB 190531B: Insight-HXMT/HE detection

At 2019-05-31T20:10:12.00 (T0), Insight-HXMT/HE detected GRB 190531B (trigger ID: HEB190531840) in a routine search of the data, which was also triggered by Fermi/GBM (GCN #24695) and Fermi/LAT (GCN #24701). The Insight-HXMT/HE light curve mainly consists of multiple pulses with a duration (T90) of 27.82 s measured from T0+7.93 s. The 1-ms peak rate, measured from T0+31.40 s, is 13079 cnts/sec. The total counts from this burst is 91598 counts. URL_LC: http://www.hxmt.org/images/GRB/HEB190531840_lc.jpg All measurements above are made with the CsI detectors operating in the regular mode with the energy range of about 80-800 keV (deposited energy). Only gamma-rays with energy greater than about 200 keV can penetrate the spacecraft and leave signals in the CsI detectors installed inside of the telescope. Insight-HXMT is the first Chinese space X-ray telescope, which was funded jointly by the China National Space Administration (CNSA) and the Chinese Academy of Sciences (CAS). More information about it could be found at: http://www.hxmt.org.