NOTE: uvot_fluxes_wget.pl vrs. 2018-11-07 fem at 190204d01h09m33s487544usUT
NOTE: Source region spec. is: 22.59662 55.72241 3"
NOTE: Used archived uvot source position of  22.59662  55.72241  3.00
NOTE: position reference is GCN_Circ_23845
NOTE: A UVOT position was reported in GCN_Circ_23845
NOTE: Possible detection in wh at T+120.9

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

GRB 190203A: 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 190203A
121 s after the BAT trigger (Lien et al., GCN Circ. 23845).
No optical afterglow consistent with the XRT position
(Goad et al. GCN Circ. 23848)
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           121          271          147         >18.5
u_FC               279          529          246         >20.2
white              121         5051          383         >19.4
v                  609         5462          225         >19.2
b                  535         4846          236         >20.5
u                  279         5967          551         >21.0
w1                 658         5872          413         >20.2
m2                 634         5666          413         >21.0
w2                 585         5257          236         >20.2

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.64 in the direction of the burst
(Schlegel et al. 1998).


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

GRB 190203A: 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 190203A
121 s after the BAT trigger (Lien et al., GCN Circ. 23845).
A source consistent with the XRT position
(Goad et al. GCN Circ. 23848)
is detected in the initial UVOT exposures.

The preliminary UVOT position is:
    RA  (J2000) =  01:30:23.21 =  22.59672 (deg.)
    Dec (J2000) = +55:43:20.6  =  55.72240 (deg.)
with an estimated uncertainty of 0.46 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              121          271          147         18.66 +/- 0.06
v                  609         5462          225        >19.2
b                  535         4846          236        >20.5
u                  279         5967          551        >21.0
w1                 658         5872          413        >20.2
m2                 634         5666          413        >21.0
w2                 585         5257          236        >20.2

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.64 in the direction of the burst
(Schlegel et al. 1998).