NOTE: uvot_fluxes_wget.pl vrs. 2018-01-16 fem at 180226d11h36m10s545607usUT
NOTE: Source region spec. is: 185.609 +29.293 3"
NOTE: Used archived BAT position of 185.60900  29.29300
NOTE: position reference is GCN_Position_Notice

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

GRB 180225: Swift/UVOT Upper Limits

F. E. Marshall (NASA/GSFC) and ***BA*** (***BA INSTITUTION***)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 180225
178 s after the BAT trigger (***Author*** et al., GCN Circ. ????).
No optical afterglow consistent with the BAT position
*** POSITION REFERENCE is GCN_Position_Notice ***
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 first
finding chart (FC) exposure and subsequent exposures are:

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

white_FC           178          328          147         >20.7
u_FC               336          586          246         >20.1
white              178         1702          411         >21.1
v                  666         1578           97         >18.7
b                  592         1504           97         >19.7
u                  336          586          246         >20.1
w1                 715         1453           58         >19.0

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.02 in the direction of the burst
(Schlegel et al. 1998).