GCN Circular 39737
Subject
GRB 250314A: Swift/UVOT Upper Limits
Date
2025-03-15T14:40:53Z (19 days ago)
From
Mike Siegel at PSU/Swift MOC <mhs18@psu.edu>
Via
Web form
M. H. Siegel (PSU) reports on behalf of the Swift/UVOT team:
Swift/UVOT observed the field of GRB250314A (Wange et al., GCN 39719) for a total of 1.6 ks
in 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).
XRT 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.