{
  "subject": "GRB 250314A: Swift/UVOT  Upper Limits",
  "circularId": 39737,
  "createdOn": 1742049653424,
  "eventId": "GRB 250314A",
  "submitter": "Mike Siegel at PSU/Swift MOC <mhs18@psu.edu>",
  "body": "M. H. Siegel (PSU) reports on behalf of the Swift/UVOT team:\n\nSwift/UVOT observed the field of GRB250314A (Wange et al., GCN 39719) for a total of 1.6 ks\nin the U-band from 5.7 ks to 7.4 ks after the SVOM/ECLAIRs detection. We detect no optical/UV source at the position of the infrared (Malesani et al., GCN Circ 39727) and XRT (Kennea et al., GCN Circ. 39734) detections to an upper limit of u>20.94. This lack of detection would be consistent with the redshift reported by Malesani et al. (GCN Circ. 39732).\n\nXRT source #2 corresponds to a known optical source with a u-band magnitude of 16.99+-0.03. XRT source #3 is off the edge of the UVOT field.",
  "format": "text/plain",
  "submittedHow": "web",
  "bibcode": "2025GCN.39737....1S"
}