TITLE: GCN CIRCULAR NUMBER: 39762 SUBJECT: GRB 250316A: Swift/UVOT Upper Limits DATE: 25/03/17 13:26:57 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 GRB250316A (GCN 39737) for a total of 3.3 ks in the white filter from 21.8 ks to 29 ks after the Fermi trigger. We detect no optical/UV source at the position of the XRT afterglow (Beardmore et al., GCN Circ. 39758) to an upper limit of white > 22.53. The magnitude is not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.017 in the direction of the burst (Schlegel et al. 1998).

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