{
  "bibcode": "2026GCN.44267....1Z",
  "format": "text/plain",
  "createdOn": 1775920491631,
  "eventId": "GRB 260409A",
  "circularId": 44267,
  "subject": "GRB 260409A: Insight-HXMT/HE detection",
  "submittedHow": "web",
  "body": "Jin-Peng Zhang, Chen-Wei Wang, Chao Zheng, and Shao-Lin Xiong (IHEP) report on behalf of the Insight-HXMT team:\n\nAt 2026-04-09T17:32:46.000 (T0), Insight-HXMT/HE detected GRB 260409A, which is also detected by Fermi/GBM (Fermi GBM Team, GCN #44249).\n\nThe Insight-HXMT/HE light curve mainly consists of several pulses with a T90 of 43 +6/-3 s. The 1 s peak rate, measured from T0+8.5 s, is 919 cnts/sec. Insight-HXMT/HE detected a total of 11547 counts from this burst.\n\nThe Insight-HXMT/HE light curve can be found here:\nhttps://www.bursthub.cn//admin/static/hxmtgrb260409A.png\n\nAll measurements above are made with the CsI detectors of Insight-HXMT/HE operating in the low gain mode with the energy range of about 300-3000 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.\n\nInsight-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://hxmten.ihep.ac.cn",
  "submitter": "zhangjinpeng@ihep.ac.cn"
}