TITLE: GCN CIRCULAR NUMBER: 5972 SUBJECT: GRB 061222B: Swift/UVOT Upper limits DATE: 06/12/22 17:47:43 GMT FROM: Shashi Pandey at MSSL S. B. Pandey (UCL-MSSL), J. L. Racusin (PSU), S. R. Oates (UCL-MSSL) report on the behalf of the Swift UVOT team: The Swift/UVOT observed the field of GRB061222B starting 136 sec after the BAT trigger (GCN Circ. 5957). We do not detect the afterglow candidate reported in GCN Circ.5956 in our V band exposures. This is in accordance with the observed redshift of z=3.355 (GCN Circ. 5962) for the burst. The determined 3-sigma upper limits for V band settling, finding-chart exposures and for the co-added frames of the observed UVOT filters are: Filter T_start T_stop Exp(s) Mag (3-sigma upper limit) ----------------------------------------------------------------- V settling 136 145 9 17.29 V finding 146 546 393 19.77 V 136 890 475 19.86 B 624 4884 141 20.29 U 600 4755 235 19.98 UVW1 576 4551 255 19.76 UVM2 552 4346 255 19.96 UVW2 640 794 38 18.64 ----------------------------------------------------------------- The values quoted above are not corrected for the expected Galactic extinction of E_{B-V} = 0.38 mag towards the burst direction (Schlegel et al. 1998).