{
  "circularId": 35477,
  "eventId": "GRB 231220A",
  "submitter": "noelklin@umbc.edu",
  "body": "N. Klingler (UMBC/NASA-GSFC/CRESST II) reports on behalf of the Swift-UVOT team:\n\nSwift-UVOT has performed follow-up observations of the Swift-BAT/GUANO-detected and Fermi-GBM-detected GRB 231220A, collecting 2.6 ks of data between T0+35.2 ks and T0+47.8 ks.  No candidate counterpart was detected.  The 3 sigma limiting (AB) magnitude in the White filter near the center of the BAT/GUANO localization (GCN 35409) is >23.20.",
  "createdOn": 1704338785379,
  "bibcode": "2024GCN.35477....1K",
  "subject": "GRB 231220A: Swift-UVOT upper limit",
  "submittedHow": "web"
}