{
  "submittedHow": "web",
  "body": "SVOM/GRM team: Chen-Wei Wang, Yang-Zhao Ren, Yue Huang, Shi-Jie Zheng, Shao-Lin Xiong, Shuang-Nan Zhang (IHEP)\n\nSVOM/ECLAIRs team: Cyril Lachaud (APC)\n\nReport on behalf of the SVOM team:\n\nSVOM/GRM was triggered in-flight by GRB 260909A (SVOM trigger reference: sb26090910) at 2026-09-09T11:18:02.000 (T0), which was also detected by SVOM/ECLAIRs (A. Saccardi et al, GCN 45534). \n\nWith the event-by-event data downloaded through the X-band ground station, the GRM light curve shows that this burst consists of multi-peaks structure with a T90 of 26.6 +2.6/-2.2 s in the 15-5000 keV band.\n\nThe SVOM/GRM light curve can be found here:\nhttps://www.bursthub.cn/gcn/2026/svgrb260909A.png\n\nWith the localization from SVOM/ECLAIRs, the time-averaged spectrum from T0-25 s to T0+20 s is best fitted a power law function with an exponential high-energy cutoff. The power law index is -1.45 +0.25/-0.24 and the cutoff energy, parameterized as Epeak, is 37 +5/-7 keV. The event fluence (10-1000 keV) in this time interval is (4.85 +0.27/−0.26)E-06 erg/cm^2. \n\nThe localization of GRB 260909A in the 'Amati' relation diagram is shown at: https://www.bursthub.cn/gcn/2026/svgrb260909A_amati.png\nThe localization of GRB 260909A in the 'Yonetoku' relation diagram is shown at: https://www.bursthub.cn/gcn/2026/svgrb260909A_yonetoku.png\n\nThe Space Variable Objects Monitor (SVOM) is a China-France joint mission led by the Chinese National Space Administration (CNSA, China), National Center for Space Studies (CNES, France) and the Chinese Academy of Sciences (CAS, China), which is dedicated to observing gamma-ray bursts and other transient phenomena in the energetic universe. GRM is developed by the Institute of High Energy Physics (IHEP) of CAS.\n\nThe SVOM/GRM point of contact for this burst is: Chen-Wei Wang (IHEP) (cwwang@ihep.ac.cn)\n",
  "submitter": "Chenwei Wang at IHEP <cwwang@ihep.ac.cn>",
  "subject": "GRB 260909A: SVOM/GRM observation ",
  "format": "text/plain",
  "circularId": 45538,
  "createdOn": 1788970744789,
  "eventType": [
    "GRB",
    "X-ray Transient"
  ],
  "bibcode": "2026GCN.45538....1S",
  "eventId": "GRB 260909A"
}