{
  "bibcode": "2021GCN.30881....1Z",
  "body": "C. Zheng, S. L. Xiong, S. Xiao, Y. Q. Zhang, W. C. Xue, X. Y. Song,   \nX. Y. Zhao, Y. Huang, S. L. Xie, C. Cai, Y. Zhao, Z. W. Guo, \nX. L. Zhang,  C. Y. Li, C. W. Wang, Q. B. Yi, B. X. Zhang, P. Zhang,\nW. X. Peng, R. Qiao, D. Y. Guo, X. B. Li, X. Ma, P. Wang, J. Wang, \nZ. Zhang, S. J. Zheng, W. Chen, J. J. He, G. Y. Zhao, Y. Q. Du,\nH. Wu, J. Liang, Q. Luo, J. C. Liu,  L. M. Song, F. J. Lu, \nS. N. Zhang (IHEP), report on behalf of GECAM team:\n\nDuring the commissioning phase, GECAM-B was triggered in-flight by a long\nbright burst, GRB 210925A, at 2021-09-25T19:12:34.600 UTC (denoted as T0),\nwhich was also detected by Fermi/GBM (GCN #30880).\n\nIts alert data was promptly downlinked to the ground through the short\nmessage service of BeiDou Navigation Satellite System (BDS). The time\nlatency of the first BeiDou message relative to the trigger time is about\n1 minute.\n\nAccording to the BDS alert data, this burst mainly consists of multiple\npulses with duration of about 10 s. \n\nThe GECAM light curve could be found here:\nhttp://twiki.ihep.ac.cn/pub/GECAM/GRBList/utn210925_191234_GECAMb.png\n\nAn automatic in-flight localization was calculated using the light curves \nand spectrum. Although the in-flight calibration of energy response and l\nocalization has not been finalized yet, GECAM-B localized this burst to \nthe following position (J2000): \nRa: 357.83 deg \nDec: -24.58 deg\nErr: 3.50 deg (1-sigma, statistical only)\nThe current systematic error of location is estimated to be several degrees \nwhich could be minimized by the ongoing calibration.\n\nPlease note that all GECAM results here are preliminary. The final analysis\nwill be published in journal papers or GECAM online catalog.\n\nGravitational wave high-energy Electromagnetic Counterpart All-sky Monitor\n(GECAM) mission consists of two small satellites (GECAM-A and GECAM-B) in\nLow Earth Orbit (600 km, 29 deg), launched on Dec 10, 2020 (Beijing Time),\nwhich was funded by the Chinese Academy of Sciences (CAS).",
  "circularId": 30881,
  "createdOn": 1632648472000,
  "email": "zhengchao97@ihep.ac.cn",
  "subject": "GRB 210925A: GECAM detection",
  "submitter": "Chao Zheng at IHEP  <zhengchao97@ihep.ac.cn>",
  "eventId": "GRB 210925A"
}