TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4778 SUBJECT: GRB 060211B: Swift/UVOT Upper Limits DATE: 06/02/18 12:25:30 GMT FROM: Padi Boyd at GSFC P. Boyd (GSFC), S. Mateos (U Leicester) and F. Marshall (GSFC) on behalf of the Swift/UVOT team report: The Swift/UVOT began observing the field of GRB 060211B at 15:56:39 UT on 2006-02-11, approximately 83 s after the BAT trigger (Mateos et al., GCN 4739). No source is detected in the refined XRT error circle (Page et al., GCN 4745) in the initial V finding chart, nor the summed images down to the following 3-sigma magnitude upper limits: Filter T_range(s) Exp(s) 3sigUL(mag) V 83-283 200 19.4 V 83-7768 869 20.5 B 290-7213 718 21.4 U 615-6955 301 20.4 UVW1 591-8168 550 20.8 UVM2 567-7972 490 20.8 UVW2 519-7604 278 21.2 White 494-7359 236 20.7 Reported times are in seconds since the BAT trigger. These magnitudes are uncorrected for the expected Galactic extinction corresponding to E(B-V) = 0.407.