NOTE: uvot_fluxes_wget.pl vrs. 2018-11-07 fem at 200510d04h20m27s699756usUT
NOTE: Source region spec. is: 116.42200 -4.63035 3"
NOTE: Used archived uvot source position of 116.42200  -4.63035  3.00
NOTE: position reference is GCN_Circ_27709
NOTE: A UVOT position was reported in GCN_Circ_27709
NOTE: Possible detection in uu at T+281.1
NOTE: Possible detection in wh at T+123.2

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

GRB 200509A: 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 200509A
123 s after the BAT trigger (Troja et al., GCN Circ. 27701).
No optical afterglow consistent with the XRT position
(Evans et al. GCN Circ. 27703)
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           123          273          147         >18.7
u_FC               281          531          246         >18.1
white              123         1702          411         >19.3
v                  611         1738          122         >18.4
b                  537         1678          117         >19.8
u                  281         1653          343         >18.5
w1                 660         1628          117         >19.2
m2                 636         1604          117         >19.0
w2                 587         1728          136         >19.4

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.13 in the direction of the burst
(Schlegel et al. 1998).


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

GRB 200509A: 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 200509A
123 s after the BAT trigger (Troja et al., GCN Circ. 27701).
A source consistent with the XRT position
(Evans et al. GCN Circ. 27703)
is detected in the initial UVOT exposures.

The preliminary UVOT position is:
    RA  (J2000) =  07:45:41.28 = 116.42200 (deg.)
    Dec (J2000) = -04:37:49.3  =  -4.63035 (deg.)
with an estimated uncertainty of 0.48 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              123          273          147         18.87 +/- 0.07
v                  611         1738          122        >18.4
b                  537         1678          117        >19.8
u                  281          531          246         18.39 +/- 0.09
w1                 660         1628          117        >19.2
m2                 636         1604          117        >19.0
w2                 587         1728          136        >19.4

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.13 in the direction of the burst
(Schlegel et al. 1998).