NOTE: uvot_fluxes_wget.pl vrs. 2018-01-16 fem at 180407d19h45m27s614933usUT
NOTE: Source region spec. is: 209.938 +48.654 3"
NOTE: Used archived BAT position of 209.93800  48.65400
NOTE: position reference is GCN_Position_Notice

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

GRB 180407: 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 180407
1238 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          1238         1388          147         >20.8
white             1238        13209         1320         >22.0
v                 1395        18100         1198         >20.3
b                 1496        12297         1234         >21.3
u                 1469         8025          307         >19.6
w1                1445        19565          858         >20.3
m2                7416        19005         1082         >20.8
w2                2063        13826          817         >20.5

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).