NOTE: uvot_fluxes_wget.pl vrs. 2018-01-16 fem at 180216d13h57m55s797222usUT
NOTE: Source region spec. is: 254.55242 -42.69881 4"
NOTE: Used archived XRT position of 254.55242 -42.69881  4.00
NOTE: position reference is GCN_Circulars-22417

=========== Draft Upper Limit Circular ========

GRB 180216: Swift/UVOT Upper Limits

S. R. Oates (U.Warwick) and ***BA*** (***BA INSTITUTION***)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 180216
4710 s after the BAT trigger (***Author*** et al., GCN Circ. ????).
No optical afterglow consistent with the XRT position
(D’Avanzo et al. GCN Circ. 22417)
is detected in the initial UVOT exposures.
Preliminary 3-sigma upper limits using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the initial exposures are:

Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

white             4710         6704          387         >20.3
v                 6915         7115          197         >18.8
b                 6299         6499          197         >20.0
u                 6094        12924          604         >19.5
w1               11600        12500          886         >20.5
m2                7120        10936          519         >20.6
w2                6710         6909          197         >20.6

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 21.16 in the direction of the burst
(Schlegel et al. 1998).