{
  "bibcode": "2021GCN.30774....1L",
  "body": "J. C. Liu, S. L. Xiong, X. Y. Zhao, Y. Huang, X. Y. Song, C. Cai, S. Xiao,\nS. L. Xie, Y. Q. Zhang, Y. Zhao, Z. W. Guo, C. Zheng, W. C. Xue, C. Y. Li,\nC. W. Wang, Q. B. Yi, B. X. Zhang, P. Zhang, W. X. Peng, R. Qiao, D. Y. Guo,\nX. B. Li, X. Ma, P. Wang, J. Wang, Z. Zhang, S. J. Zheng, W. Chen, J. J. He, \nG. Y. Zhao, Y. Q. Du, H. Wu, J. Liang, Q. Luo, X. L. Zhang,\nL. M. Song, F. J. Lu, S. N. Zhang (IHEP), report on behalf of GECAM team:\n\nDuring the commissioning phase, GECAM-B was triggered in-flight by a long\nburst, GRB 210827B, at 2021-08-27T10:10:16.60 UTC (denoted as T0), \nwhich was also observed by Fermi/GBM (GCN #30726). \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 20 s. \n\nThe GECAM light curve could be found here:\nhttp://twiki.ihep.ac.cn/pub/GECAM/GRBList/gecamb_lc_grd_all_combine_83758216.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: 307.5 deg \nDec: -19.2 deg\nErr: 3.5 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 GECAM preliminary location could be found here: \nhttp://twiki.ihep.ac.cn/pub/GECAM/GRBList/gecamb_skymap_bdm_83758216_V01.png\n\nGECAM location is consistent with the Fermi/GBM position within the error.\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": 30774,
  "createdOn": 1630857363000,
  "email": "yqzhang@ihep.ac.cn",
  "subject": "GRB 210827B: GECAM detection",
  "submitter": "Y Q Zhang at IHEP  <yqzhang@ihep.ac.cn>",
  "eventId": "GRB 210827B"
}