{
  "bibcode": "2021GCN.30877....1K",
  "body": "Felicia Krauss, Timoth��e Gregoire, Derek Fox, Doug Cowen, Hugo Ayala\n(PSU) and Alexis Coleiro (APC) report for AMON (https://amon.psu.edu/):\n\nThe Neil Gehrels Swift Observatory X-ray Telescope (XRT) observed the\nuncertainty region of the IceCube neutrino event IceCube-210922A (GCN\nCirc. 30862) on 2021-09-23, between 02:00 and 21:52 UTC .\nA 6-point tiling observation centered on the neutrino position was taken\nfor a total of 3.5 ksec.\nOf the 90% confidence 1.23 sq. degrees uncertainty region, the XRT\nobservations cover roughly 75% of the central area.\n\nNo X-ray candidate counterparts were detected above a level of 3 sigma.\n\nThe 3 sigma upper limit for the flux is  1.2x10^(-13) ergs/s/cm^2.",
  "circularId": 30877,
  "createdOn": 1632516764000,
  "email": "hgayala@psu.edu",
  "subject": "IceCube-210922A: No Candidate Counterparts from Swift/XRT follow up observations",
  "submitter": "Hugo Ayala at Pennsylvania State University  <hgayala@psu.edu>",
  "eventId": "IceCube-210922A"
}