NOTE: uvot_fluxes_wget.pl vrs. 2018-01-16 fem at 180810d18h22m52s068925usUT
NOTE: Source region spec. is: 144.436 -42.767 3"
NOTE: Used archived BAT position of 144.43600 -42.76700
NOTE: position reference is GCN_Position_Notice

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

GRB 180810: 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 180810
154 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           154          304          147         >19.9
u_FC               312          562          246         >19.1
white              154         6306          503         >20.5
v                  643         6717          432         >18.8
b                  568         6101          236         >19.5
u                  312         5896          462         >19.5
w1                 692         5690          216         >19.1
m2                 840         6731          225         >19.3
w2                 618         6512          432         >19.6

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.52 in the direction of the burst
(Schlegel et al. 1998).