NOTE: uvot_fluxes_wget.pl vrs. 2020-11-03a fem at 220618d16h31m19s730513usUT
NOTE: Source region spec. is: 38.98604 55.21567 4"
NOTE: Used archived XRT position of  38.98604  55.21567  4.00
NOTE: position reference is GCN_Circulars-32216
NOTE: Possible detection in bb at T+565.3

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

GRB 220618A: Swift/UVOT Upper Limits

N. P. M. Kuin (UCL-MSSL) and E. Troja (NASA/GSFC/UMCP)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 220618A
151 s after the BAT trigger (Troja et al., GCN Circ. 32214).
No optical afterglow consistent with the XRT position
(Osborne et al. GCN Circ. 32216)
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           151          301          147         >19.9
u_FC               309          559          246         >18.8
white              151         4920          363         >20.4
v                  641          649            8         >16.4
b                  565         4715          216         >19.5
u                  309         4510          442         >19.3
w1                4105         4305          197         >19.3
m2                3900         4100          197         >19.1
w2                 617         5126          216         >19.8

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.392 in the direction of the burst
(Schlegel et al. 1998).


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

GRB 220618A: Swift/UVOT Detection

N. P. M. Kuin (UCL-MSSL) and E. Troja (NASA/GSFC/UMCP)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 220618A
151 s after the BAT trigger (Troja et al., GCN Circ. 32214).
A source consistent with the XRT position
(Osborne et al. GCN Circ. 32216)
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              151         4920          363        >20.4
v                  641          649            8        >16.4
b                  565          585           20         17.98 +/- 0.32
u                  309         4510          442        >19.3
w1                4105         4305          197        >19.3
m2                3900         4100          197        >19.1
w2                 617         5126          216        >19.8

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.392 in the direction of the burst
(Schlegel et al. 1998).