{
  "bibcode": "2023GCN.33406....1X",
  "body": "Shaolin Xiong, Chenwei Wang, Yue Huang, report on behalf of the GECAM team:\n\nGECAM-B was triggered in-flight by the extremely bright long burst at \n2023-03-07T15:44:06.650 UTC (T0), which was also observed by Fermi/GBM \n(GCN 33405).\n\nThe GECAM-B ground calculated location (J2000) is:\n\nR.A.: 28.03 [deg]\nDec.: -81.51 [deg]\nError: 1 [deg] (1-sigma, statistical only)\n\nThe systematic error of this location is estimated to be ~2 degrees. \nThis GECAM location is consistent with the Fermi/GBM one within error.\n\nThe GECAM-B light curve shows a roughly FRED shape with a possible \nprecursor, with a total duration of ~100 sec. The time-averaged spectrum \nanalysis on the trigger alert data shows this burst has a fluence of \nabout 1E-3 erg/cm2 in 20-1000 keV, which is notably high, and comparable \nto GRB 130427A.  We caution that this analysis is very preliminary. \nRefined analysis will be reported later.\n\nFollow-up observations are encouraged.",
  "circularId": 33406,
  "createdOn": 1678208025000,
  "email": "dxu@nao.cas.cn",
  "subject": "GRB 230307A: GECAM detection of an extremely bright burst",
  "submitter": "Dong Xu at NAOC/CAS  <dxu@nao.cas.cn>",
  "eventId": "GRB 230307A"
}