NOTE: uvot_fluxes_wget.pl vrs. 2018-01-16 fem at 180531d10h52m39s430125usUT
NOTE: Source region spec. is: 210.49467 12.01508 4"
NOTE: Used archived XRT position of 210.49467  12.01508  4.00
NOTE: position reference is GRB_Auto_Processing
NOTE: Possible detection in uu at T+287.2
NOTE: Possible detection in wh at T+129.2
NOTE: Possible detection in bb at T+543.0
NOTE: Possible detection in w1 at T+839.4
NOTE: Possible detection in vv at T+1218.4 sum
NOTE: Possible detection in w2 at T+5928.1
NOTE: Possible detection in m2 at T+6337.6

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

GRB 180531: 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 180531
129 s after the BAT trigger (***Author*** et al., GCN Circ. ????).
No optical afterglow consistent with the XRT position
*** POSITION REFERENCE is GRB_Auto_Processing ***
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           129          279          147         >18.0
u_FC               287          537          246         >17.7
white              129         7359          824         >18.1
v                  618         7684          445         >18.4
b                  543         7153          529         >18.7
u                  287         6948          756         >17.9
w1                 839         6742          490         >17.5
m2                1071         6537          216         >17.2
w2                5928         7565          393         >17.5

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).


=========== Draft Detection Circular ========

GRB 180531: Swift/UVOT Detection

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 180531
129 s after the BAT trigger (***Author*** et al., GCN Circ. ????).
A source consistent with the XRT position
*** POSITION REFERENCE is GRB_Auto_Processing ***
is detected in the initial UVOT exposures.

Preliminary detections using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are: 

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

white              129          279          147         18.15 +/- 0.05
v                  618         6333          333         18.85 +/- 0.17
b                  543          736           39         18.68 +/- 0.20
u                  287          537          246         17.91 +/- 0.07
w1                 839         1461           58         17.60 +/- 0.18
m2                6338         6537          197         17.57 +/- 0.12
w2                5928         6128          197         17.67 +/- 0.11

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).