NOTE: uvot_fluxes_wget.pl vrs. 2018-11-07 fem at 200410d19h00m10s275257usUT
NOTE: Source region spec. is: 299.64717 +51.78138 3"
NOTE: Used archived uvot source position of 299.64717  51.78138  3.00
NOTE: position reference is GCN_Circ_27518
NOTE: A UVOT position was reported in GCN_Circ_27518
NOTE: Possible detection in uu at T+316.7
NOTE: Possible detection in wh at T+104.3
NOTE: Possible detection in bb at T+1499.5 sum
NOTE: Possible detection in vv at T+1052.2 sum

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

GRB 200410A: Swift/UVOT Upper Limits

N. P. M. Kuin (UCL-MSSL) and K. K. Simpson (PSU)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 200410A
104 s after the BAT trigger (Simpson et al., GCN Circ. 27518).
No optical afterglow consistent with the XRT position
(Goad et al. GCN Circ. 27522)
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           104          254          147         >18.8
u_FC               317          566          246         >19.3
white              104         1544          390         >19.3
v                  647         5251          313         >18.4
b                  572         1519           97         >18.9
u                  317         1494          324         >19.4
w1                 696         1470           78         >18.4
m2                 671         5273          122         >19.6
w2                 622         1569          117         >19.3

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.15 in the direction of the burst
(Schlegel et al. 1998).


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

GRB 200410A: Swift/UVOT Detection

N. P. M. Kuin (UCL-MSSL) and K. K. Simpson (PSU)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 200410A
104 s after the BAT trigger (Simpson et al., GCN Circ. 27518).
A source consistent with the XRT position
(Goad et al. GCN Circ. 27522)
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              104          254          147         19.06 +/- 0.08
v                  647         5251          313         18.89 +/- 0.19
b                  572         1519           97         19.61 +/- 0.32
u                  317          741          265         19.86 +/- 0.23
w1                 696         1470           78        >18.4
m2                 671         5273          122        >19.6
w2                 622         1569          117        >19.3

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.15 in the direction of the burst
(Schlegel et al. 1998).