NOTE: uvot_fluxes_wget.pl vrs. 2020-11-03a fem at 220404d05h32m41s196250usUT
NOTE: Source region spec. is: 191.47207 89.18518 3"
NOTE: Used archived uvot source position of 191.47207  89.18518  3.00
NOTE: position reference is GCN_Circ_31820
NOTE: A UVOT position was reported in GCN_Circ_31820
NOTE: Possible detection in uu at T+317.6
NOTE: Possible detection in wh at T+105.3
WARNING: Did not recognize UBS name.

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

GRB 220403B: Swift/UVOT Upper Limits

Klingler (***INSTITUTION***) reports on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 220403B
105 s after the BAT trigger (Klingler et al., GCN Circ. 31820).
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           105          255          147         >19.5
u_FC               318          567          246         >19.4
white              105         1023          334         >19.6
v                  647         1074           58         >18.6
b                  573          766           39         >19.3
u                  318          741          265         >19.4
w1                 697          716           19         >18.9
w2                 797         1049           39         >19.9

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.208 in the direction of the burst
(Schlegel et al. 1998).


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

GRB 220403B: Swift/UVOT Detection

Klingler (***INSTITUTION***) reports on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 220403B
105 s after the BAT trigger (Klingler et al., GCN Circ. 31820).
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) =  12:45:53.46 = 191.47274 (deg.)
    Dec (J2000) = +89:11:06.5  =  89.18515 (deg.)
with an estimated uncertainty of 0.52 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              105          255          147         19.86 +/- 0.12
v                  647         1074           58        >18.6
b                  573          766           39        >19.3
u                  318          741          265         19.93 +/- 0.22
w1                 697          716           19        >18.9
w2                 797         1049           39        >19.9

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.208 in the direction of the burst
(Schlegel et al. 1998).