NOTE: uvot_fluxes_wget.pl vrs. 2018-11-07 fem at 190423d05h50m00s039715usUT
NOTE: Source region spec. is: 182.03450 -60.22425 4"
NOTE: Used archived XRT position of 182.03450 -60.22425  4.00
NOTE: position reference is GCN_Circulars-24151
NOTE: Possible detection in uu at T+1817.6 sum
NOTE: Possible detection in wh at T+532.1
NOTE: Possible detection in bb at T+787.7
NOTE: Possible detection in vv at T+1046.2 sum

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

GRB 190422A: Swift/UVOT Upper Limits

K. K. Simpson (PSU) and M. J. Moss (George Washington University)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 190422A
532 s after the BAT trigger (Moss et al., GCN Circ. 24147).
No optical afterglow consistent with the XRT position
(Evans et al. GCN Circ. 24151)
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           532          682          147         >18.8
white              532         7906          647         >18.8
v                  689         6879          352         >17.2
b                  788         7700          352         >18.3
u                  763         7495          352         >18.9
w1                 738         7289          352         >19.1
m2                 713         7084          352         >19.1
w2                 838         7995          438         >19.6

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 1.58 in the direction of the burst
(Schlegel et al. 1998).


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

GRB 190422A: Swift/UVOT Detection

K. K. Simpson (PSU) and M. J. Moss (George Washington University)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 190422A
532 s after the BAT trigger (Moss et al., GCN Circ. 24147).
A source consistent with the XRT position
(Evans et al. GCN Circ. 24151)
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              532          682          147         19.07 +/- 0.10
v                  689         1240           58         17.57 +/- 0.20
b                  788         1165           39         18.32 +/- 0.18
u                  763         7495          352         19.32 +/- 0.18
w1                 738         7289          352        >19.1
m2                 713         7084          352        >19.1
w2                 838         7995          438        >19.6

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 1.58 in the direction of the burst
(Schlegel et al. 1998).