{
  "bibcode": "2021GCN.29363....1H",
  "body": "Y. Huang, S. J. Zheng, F. J. Lu, S. N. Zhang, L. M. Song, W. X. Peng,\nS. L. Xiong, S. Xiao, C. Cai, X. Y. Zhao, X. Ma, P. Zhang, B. X. Zhang,\nZ. H. An, C. Chen, G. Chen, W. Chen, M. Gao, K. Gong, D. Y. Guo,\nJ. J. He, B. Li, C. Li, C. Y. Li, J. H. Li, Q. X. Li,\nX. B. Li, X. Q. Li, Y. G. Li, X. H. Liang, J. Y. Liao, J. C. Liu,\nX. J. Liu, Y. Q. Liu, Q. Luo, G. Ou, W. X. Peng, R. Qiao,\nD. L. Shi, J. Y. Shi, X. Y. Song, G. X. Sun, X. L. Sun,\nY. L. Tuo, C. W. Wang, J. Z. Wang, P. Wang, X. Y. Wen, Y. B. Xu,\nY. P. Xu, W. C. Xue, S. Yang, M. Yao, Q. B. Yi, C. Y. Zhang,\nD. L. Zhang, Fan Zhang, Fei Zhang, H. M. Zhang, K. Zhang,\nS. N. Zhang, Y. Q. Zhang, Z. Zhang, S. Y. Zhao, Y. Zhao, C. Zheng,\nX. Zhou (IHEP),\nreport on behalf of GECAM team:\n\nDuring the commissioning phase, GECAM-B was triggered in-flight by\na short burst (trig# 65429420) at 2021-01-27T06:50:20.750 UTC (T0).\nIts alert data was promptly downlinked to the ground through the\nshort message service of BeiDou Navigation Satellite System (BDS).\nThe time latency of the first BeiDou message relative to the trigger time\nis about 1 minute.\n\nAccording to the BDS alert data, this burst mainly consists of\ntwo pulses with a duration of roughly 100 ms.\nThere is no much emission above 100 keV.\n\nThe in-flight position (J2000) given by GECAM-B is:\nRa: 291.31 deg Dec: 23.67 deg\nGalactic lon: 57.74 deg, lat: 3.63 deg\nErr: 2.16 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 light curve could be found here:\nhttp://twiki.ihep.ac.cn/pub/GECAM/GRBList/gecamb_hrlc_grd_65429420.png\n\nThe GECAM preliminary location could be found here:\nhttp://twiki.ihep.ac.cn/pub/GECAM/GRBList/gecamb_skymap_65429420.png\n\nAccording to the location and light curve, we suggest that this burst\nis very likely from SGR 1935+2154 which seems to be active recently.\n\nThis is the first short trigger of GECAM which downlinked the\nhigh resolution light curve through BDS successfully.\n\nAs the detailed science data are downloaded, all analyses would be improved.\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": 29363,
  "createdOn": 1611735250000,
  "email": "xiongsl@ihep.ac.cn",
  "subject": "GECAM detection of a short burst probably from SGR 1935+2154",
  "submitter": "Shaolin Xiong at IHEP  <xiongsl@ihep.ac.cn>",
  "eventId": "SGR 1935+2154"
}