NOTE: uvot_fluxes_wget.pl vrs. 2020-10-20 fem at 201025d03h10m41s722154usUT
NOTE: Source region spec. is: 125.95229 3.35403 3"
NOTE: Used archived uvot source position of 125.95229   3.35403  3.00
NOTE: position reference is GCN_Circ_28761
NOTE: A UVOT position was reported in GCN_Circ_28761
NOTE: Possible detection in uu at T+725.8
NOTE: Possible detection in wh at T+495.3
NOTE: Possible detection in bb at T+750.5
NOTE: Possible detection in w1 at T+701.5
NOTE: Possible detection in vv at T+652.6

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

GRB 201024A: Swift/UVOT Upper Limits

N. P. M. Kuin (UCL-MSSL) and F. E. Marshall (NASA/GSFC)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 201024A
495 s after the BAT trigger (Marshall et al., GCN Circ. 28761).
No optical afterglow consistent with the XRT position
(Evans et al. GCN Circ. 28770)
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           495          645          147         >17.9
white              495         2065          430         >18.3
v                  653         2115          175         >18.0
b                  750         2042          136         >19.0
u                  726         2017          136         >18.0
w1                 702         1992          136         >18.0
m2                 677         2140          175         >18.8
w2                 801         2091          156         >19.5

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.03 in the direction of the burst
(Schlegel et al. 1998).


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

GRB 201024A: Swift/UVOT Detection

N. P. M. Kuin (UCL-MSSL) and F. E. Marshall (NASA/GSFC)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 201024A
495 s after the BAT trigger (Marshall et al., GCN Circ. 28761).
A source consistent with the XRT position
(Evans et al. GCN Circ. 28770)
is detected in the initial UVOT exposures.

The preliminary UVOT position is:
    RA  (J2000) =  08:23:48.56 = 125.95233 (deg.)
    Dec (J2000) = +03:21:14.6  =   3.35405 (deg.)
with an estimated uncertainty of 0.44 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              495          645          147         18.03 +/- 0.05
v                  653         1076           58         17.83 +/- 0.19
b                  750         1348           58         19.07 +/- 0.23
u                  726         1150           39         18.03 +/- 0.19
w1                 702         1643           97         18.19 +/- 0.19
m2                 677         2140          175        >18.8
w2                 801         2091          156        >19.5

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.03 in the direction of the burst
(Schlegel et al. 1998).