NOTE: uvot_fluxes_wget.pl vrs. 2020-11-03a fem at 220923d21h18m22s337891usUT
NOTE: Source region spec. is: 135.6513 -40.7171 4"
NOTE: Used archived XRT position of 135.65130 -40.71710  4.00
NOTE: position reference is GCN_Notice
NOTE: Possible detection in wh at T+5002.0
WARNING: t_start for light curve (4433) and t_start from the exposure report (179) do not agree.
  Replace ??? in draft Circular with correct value.

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

GRB 220923: Swift/UVOT Upper Limits

N. P. M. Kuin (UCL-MSSL) and ***BA*** (***BA INSTITUTION***)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 220923
***???*** s after the BAT trigger (***Author*** et al., GCN Circ. ????).
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          4433         4583          147         >19.9
white             4433         5202          344         >20.0
b                 4797         4997          197         >19.7
u                 4592         4792          197         >19.6
w2                5208         5212            4         >17.6

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 1.059 in the direction of the burst
(Schlegel et al. 1998).


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

GRB 220923: Swift/UVOT Detection

N. P. M. Kuin (UCL-MSSL) and ***BA*** (***BA INSTITUTION***)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 220923
***???*** s after the BAT trigger (***Author*** et al., GCN Circ. ????).
A source consistent with the XRT position
*** POSITION REFERENCE is GCN_Notice ***
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             4433         5202          344         20.64 +/- 0.26
b                 4797         4997          197        >19.7
u                 4592         4792          197        >19.6
w2                5208         5212            4        >17.6

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 1.059 in the direction of the burst
(Schlegel et al. 1998).