{
  "bibcode": "2021GCN.29486....1Z",
  "body": "Y. Zhao, X. Y. Song, S. Xiao, C. Cai, S. L. Xiong, Y. Huang, C. Y. Li,\nJ. J. He, Q. B. Yi, B. X. Zhang, Y. Q. Zhang, S. Y. Zhao, C. Zheng,\nZ. H. An, C. Chen, G. Chen, W. Chen, M. Gao, K. Gong, D. Y. Guo, B. Li,\nC. Li, J. H. Li, Q. X. Li, X. B. Li, X. Q. Li, Y. G. Li, X. H. Liang,\nJ. Y. Liao, J. C. Liu, X. J. Liu, Y. Q. Liu, F. J. Lu, Q. Luo, X. Ma,\nG. Ou, W. X. Peng, R. Qiao, D. L. Shi, J. Y. Shi, L. M. Song,\nJ. C. Liu, G. X. Sun, X. L. Sun, Y. L. Tuo, C. W. Wang, J. Z. Wang,\nP. Wang, X. Y. Wen, Y. B. Xu, Y. P. Xu, W. C. Xue, S. Yang, M. Yao,\nC. Y. Zhang,D. L. Zhang, Fan Zhang, Fei Zhang, H. M. Zhang, K. Zhang,\nP. Zhang, S. N. Zhang, Z. Zhang, X. Y. Zhao, S. J. Zheng, X. Zhou (IHEP),\nreport on behalf of GECAM team:\n\nDuring the commissioning phase, the ground search of GECAM-B data found\na long burst, GRB 210207B, at 2021-02-07T21:52:14.050 UTC (T0), which\nwas also reported by Swift/BAT (GCN #29420, #29435), Konus/Wind (GCN #29426),\nAGILE (GCN #29428) and Insight-HXMT/HE (GCN #29434). \nThe later bright pulse also triggered GECAM-B in-flight.\n\nAccording to the GECAM-B light curves in about 8 keV-4 MeV, this burst\nmainly consists of multiple pulses with a duration (T90) of 45.0 +/- 4.5 s\nstarting from T0 - 1.8 s. The 1-s peak counts rate is about 1300 cps\nwhile the total counts is about 4600 counts.\n\nAlthough the in-flight calibration of energy response and\nlocalization has not been finalized yet, GECAM-B localized this burst to\nthe following position (J2000):\n\nRa: 275.00 deg Dec: 51.57 deg\nErr: 8.23 deg (1-sigma, statistical only)\n\nThe current systematic error of location is estimated to be several degrees\nwhich could be minimized by the ongoing calibration.\n\nThis position is consistent with Swift (GCN #29420) within the error.\n\nThe GECAM light curve could be found here:\nhttp://twiki.ihep.ac.cn/pub/GECAM/GRBList/GECAM-B-tn210207_215215.pdf\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": 29486,
  "createdOn": 1613100763000,
  "email": "yizhao@ihep.ac.cn",
  "subject": "GRB 210207B: GECAM detection",
  "submitter": "Zhao Yi at POLAR  <yizhao@ihep.ac.cn>",
  "eventId": "GRB 210207B"
}