NOTE: uvot_fluxes_wget.pl vrs. 2018-01-16 fem at 180618d03h12m46s787369usUT
NOTE: Source region spec. is: 169.94074 73.83704 3"
NOTE: Used archived uvot source position of 169.94074  73.83704  3.00
NOTE: position reference is GCN_Circ_22790
NOTE: A UVOT position was reported in GCN_Circ_22790
NOTE: Possible detection in uu at T+298.0
NOTE: Possible detection in wh at T+86.1
NOTE: Possible detection in bb at T+725.4
NOTE: Possible detection in w1 at T+850.0
NOTE: Possible detection in vv at T+800.4 sum
NOTE: Possible detection in w2 at T+1205.3 sum

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

GRB 180618A: Swift/UVOT Upper Limits

M. H. Siegel (PSU) and S. J. LaPorte (PSU)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 180618A
86 s after the BAT trigger (LaPorte et al., GCN Circ. 22790).
No optical afterglow consistent with the XRT position
*** POSITION REFERENCE is GCN_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            86          236          147         >17.4
u_FC               298          548          246         >17.3
white               86         1546          392         >17.9
v                  628         1596          117         >18.2
b                  553         1522           97         >18.7
u                  298         1496          324         >17.5
w1                 676         1472           97         >18.0
m2                1254         1621           58         >17.6
w2                 604         1572          117         >18.4

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.07 in the direction of the burst
(Schlegel et al. 1998).


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

GRB 180618A: Swift/UVOT Detection

M. H. Siegel (PSU) and S. J. LaPorte (PSU)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 180618A
86 s after the BAT trigger (LaPorte et al., GCN Circ. 22790).
A source consistent with the XRT position
*** POSITION REFERENCE is GCN_Notice ***
is detected in the initial UVOT exposures.

The preliminary UVOT position is:
    RA  (J2000) =  11:19:45.84 = 169.94102 (deg.)
    Dec (J2000) = +73:50:13.5  =  73.83707 (deg.)
with an estimated uncertainty of 0.43 arc sec. (radius, 90% confidence).

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               86          236          147         17.46 +/- 0.04
v                  628         1596          117         18.71 +/- 0.22
b                  553         1175           58         18.84 +/- 0.16
u                  298          548          246         17.50 +/- 0.06
w1                 676         1472           97         18.59 +/- 0.24
m2                1254         1621           58        >17.6
w2                 604         1398           97         18.85 +/- 0.28

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.07 in the direction of the burst
(Schlegel et al. 1998).