NOTE: uvot_fluxes_wget.pl vrs. 2018-01-16 fem at 180812d17h57m26s480795usUT
NOTE: Source region spec. is: 245.83467 74.66472 4"
NOTE: Used archived XRT position of 245.83467  74.66472  4.00
NOTE: position reference is GCN_Circulars-23131
NOTE: Possible detection in wh at T+112.4

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

GRB 180812A: Swift/UVOT Upper Limits

***UBS*** (***INSTITUTION***) and A. Y. Lien (GSFC/UMBC)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 180812A
112 s after the BAT trigger (Lien et al., GCN Circ. 23129).
No optical afterglow consistent with the XRT position
(Goad et al. GCN Circ. 23131)
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           112          262          147         >19.3
u_FC               270          520          246         >19.3
white              112         6199          647         >20.2
v                  600         6610          372         >18.9
b                  526         5994          352         >20.0
u                  270         5789          598         >19.8
w1                 650         6857          211         >19.5
m2                6616         6815          197         >20.2
w2                6206         6406          197         >20.2

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.04 in the direction of the burst
(Schlegel et al. 1998).


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

GRB 180812A: Swift/UVOT Detection

***UBS*** (***INSTITUTION***) and A. Y. Lien (GSFC/UMBC)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 180812A
112 s after the BAT trigger (Lien et al., GCN Circ. 23129).
A source consistent with the XRT position
(Goad et al. GCN Circ. 23131)
is detected in the initial UVOT exposures.

Preliminary detections and 3-sigma upper limits 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              112         1893          431         20.46 +/- 0.22
v                  600         6610          372        >18.9
b                  526         5994          352        >20.0
u                  270         5789          598        >19.8
w1                 650         6857          211        >19.5
m2                6616         6815          197        >20.2
w2                6206         6406          197        >20.2

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.04 in the direction of the burst
(Schlegel et al. 1998).