{
  "bibcode": "2021GCN.31331....1Z",
  "body": "G. Y. Zhao, S. L. Xiong, X. L. Zhang , S. Xiao, C. Cai, J. J. He, Y. Huang,\nZ. W. Guo, C. Y. Li, X. B. Li, J. C. Liu, X. Y. Song,Y. Zhao, P. Wang,\nS. L. Xie, W. C. Xue,Q. B. Yi, Y. Q. Zhang,  X. Y. Zhao, C. Zheng, Y. Q. Du, \nD. Y. Guo, J. Liang, F. J. Lu, Q. Luo, X. Ma, W. X. Peng, R. Qiao, L. M. Song,\nJ. Wang, H. Wu, P. Zhang, S. N. Zhang, Z. Zhang,C. W. Wang, S. J. Zheng (IHEP),\nreport on behalf of GECAM team:\n\nDuring the commissioning phase, GECAM-B was triggered in-flight by a long \nburst, GRB 211229A, at 2021-12-29T03:30:05.200 UTC (denoted as T0),\nwhich was also observed by Fermi/GBM (GCN #31329).\n \nGECAM alert data was downlinked to the ground through the short message\nservice of BeiDou Navigation Satellite System (BDS) within ~60 s after T0.\n\nAccording to the BDS alert data, this burst mainly consists of a broad pulse\nwith a duration of about 50 s. \n\nThe GECAM light curve could be found here:\nhttp://twiki.ihep.ac.cn/pub/GECAM/GRBList/gecamb_lc_grd_all_combine_94447805.png\n\nUsing the automatic on-ground localization pipeline with the BDS alert data, \nGECAM-B localized this burst to the following position (J2000): \nRa:  302.7 deg \nDec: 27.5 deg\nErr: 8.7 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\nThe location is very close to SGR J1935+2154 and cannot be ruled out as \noriginating from it. The GECAM preliminary location could be found here: \nhttp://twiki.ihep.ac.cn/pub/GECAM/GRBList/gecamb_skymap_fit_94447805.png\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": 31331,
  "createdOn": 1640756028000,
  "email": "gyzhao@ihep.ac.cn",
  "subject": "GRB 211229A: GECAM detection",
  "submitter": "Guoying Zhao at IHEP  <gyzhao@ihep.ac.cn>",
  "eventId": "GRB 211229A"
}