{
  "bibcode": "2022GCN.32745....1G",
  "body": "Authors: A. Guha (Centre for Lightning and Thunderstorm Studies (CeLTS), \nDepartment of Physics, Tripura University, India.), P. Nicholson \n(Todmorden, UK)\n\nWe report the observation of a sudden disturbance of radio propagation \nin the very low frequency (VLF) band between 18kHz and 23kHz coincident with\nGRB221009A. Affected were phase and amplitude of MSK (\"Minimum Shift \nKeying\") signals from naval transmitters monitored by the Indian \nLightning Detection Network.\n\nThe GRB221009A exceeded 70 degrees elevation at all receiver sites.\n\nhttps://ildn.in/gallery/ILDN-GRB221009A-VTX3.png\nhttps://ildn.in/gallery/ILDN-GRB221009A-NWC.png\nhttps://ildn.in/gallery/ILDN-GRB221009A-NDT.png\n\nThe Indian Lightning Detection Network (ILDN) is an experimental network \nof 10 VLF receivers operated by collaborating institutions for lightning \nlocation and observation of other VLF phenomena on the Indian subcontinent.",
  "circularId": 32745,
  "createdOn": 1665697706000,
  "email": "welch@physics.mcmaster.ca",
  "subject": "GRB221009A: Ionospheric disturbance observed in India",
  "submitter": "Doug Welch at McMaster University  <welch@physics.mcmaster.ca>",
  "eventId": "GRB 221009A"
}