NOTE: uvot_fluxes_wget.pl vrs. 2018-11-07 fem at 190104d14h31m17s195621usUT
NOTE: Source region spec. is: 212.56929 35.26100 4"
NOTE: Used archived XRT position of 212.56929  35.26100  4.00
NOTE: position reference is GCN_Circulars-23603
NOTE: Possible detection in uu at T+34957.9

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

GRB 190103B: Swift/UVOT Upper Limits

A. A. Breeveld (UCL-MSSL) 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 190103B
103 s after the BAT trigger (Lien et al., GCN Circ. 23602).
No optical afterglow consistent with the XRT position
(Evans et al. GCN Circ. 23603)
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           103          253          147         >20.3
u_FC               316          565          246         >19.3
white              103        23827         1860         >22.1
v                  646        40393         2202         >21.0
b                  571        46547         2987         >22.2
u                  316        46101         3922         >21.1
w1                4776        45188         3715         >21.3
m2                4570        41036         2792         >22.1
w2                4161        39480         1904         >21.1

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.01 in the direction of the burst
(Schlegel et al. 1998).


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

GRB 190103B: Swift/UVOT Detection

A. A. Breeveld (UCL-MSSL) 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 190103B
103 s after the BAT trigger (Lien et al., GCN Circ. 23602).
A source consistent with the XRT position
(Evans et al. GCN Circ. 23603)
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              103        23827         1860        >22.1
v                  646        40393         2202        >21.0
b                  571        46547         2987        >22.2
u                34958        35258          295         19.41 +/- 0.29
w1                4776        45188         3715        >21.3
m2                4570        41036         2792        >22.1
w2                4161        39480         1904        >21.1

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.01 in the direction of the burst
(Schlegel et al. 1998).