{
  "bibcode": "2022GCN.32677....1H",
  "body": "Yong Huang, Shicong Hu, Songzhan Chen,  Min Zha, Cheng Liu, Zhiguo Yao and\r\nZhen Cao report on behalf of the LHAASO experiment\r\n\r\nWe report the observation of GRB 221009A, which was detected by Swift (Kennea\r\net al. GCN #32635), Fermi-GBM (Veres et al. GCN #32636, Lesage et al. GCN #32642),\r\nFermi-LAT (Bissaldi et al. GCN #32637), IPN (Svinkin et al. GCN #32641) and so on.\r\n\r\nGRB 221009A is detected by LHAASO-WCDA at energy above 500 GeV, centered at\r\nRA = 288.3, Dec = 19.7 within 2000 seconds after T0, with the significance above\r\n100 s.d., and is observed as well by LHAASO-KM2A with the significance about 10 s.d.,\r\nwhere the energy of the highest photon reaches 18 TeV.\r\n\r\nThis represents the first detection of photons above 10 TeV from GRBs.\r\n\r\nThe LHAASO is a multi-purpose experiment for gamma-ray astronomy (in the energy\r\nband between 10^11 and 10^15 eV) and cosmic ray measurements.",
  "circularId": 32677,
  "createdOn": 1665480114000,
  "email": "judith.racusin@nasa.gov",
  "subject": "LHAASO observed GRB 221009A with more than 5000 VHE photons up to around 18 TeV",
  "submitter": "Judith Racusin at GSFC  <judith.racusin@nasa.gov>",
  "eventId": "GRB 221009A"
}