TITLE: GCN CIRCULAR NUMBER: 39737 SUBJECT: GRB 250314A: Swift/UVOT Upper Limits DATE: 25/03/15 14:40:53 GMT FROM: Mike Siegel at PSU/Swift MOC mhs18@psu.edu

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.

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