NOTE: uvot_fluxes_wget.pl vrs. 2024-08-27 fem at 250824d18h42m53s481509usUT
NOTE: Source region spec. is: 297.47812 -24.99558 4"
NOTE: Used archived XRT position of 297.47812 -24.99558  4.00
NOTE: position reference is GCN_Circulars-41515
NOTE: Possible detection in wh at T+126.5
NOTE: Possible detection in vv at T+842.7
NOTE: Possible detection in bb at T+766.9 sum

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

GRB 250823A: Swift/UVOT Upper Limits

***UBS*** (***INSTITUTION***) and M. H. Siegel (PSU)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 250823A
126 s after the BAT trigger (Siegel et al., GCN Circ. 41511).
No optical afterglow consistent with the XRT position
*** POSITION REFERENCE is GCN_Circulars-41515 ***
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           126          276          147         >19.9
u_FC               338          588          246         >19.3
white              126         1366          373         >20.0
v                  668         1244           78         >17.8
b                  594         1342           78         >18.9
u                  338         1317          304         >19.5
w1                 718         1292           58         >19.1
m2                 692         1268           58         >18.8
w2                 644         1391           97         >19.3

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.111 in the direction of the burst
(Schlegel et al. 1998).


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

GRB 250823A: Swift/UVOT Detection

***UBS*** (***INSTITUTION***) and M. H. Siegel (PSU)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 250823A
126 s after the BAT trigger (Siegel et al., GCN Circ. 41511).
A source consistent with the XRT position
*** POSITION REFERENCE is GCN_Circulars-41515 ***
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              126         1020          334         20.42 +/- 0.17
v                  668         1244           78         18.43 +/- 0.28
b                  594         1169           58         19.25 +/- 0.28
u                  338         1317          304        >19.5
w1                 718         1292           58        >19.1
m2                 692         1268           58        >18.8
w2                 644         1391           97        >19.3

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.111 in the direction of the burst
(Schlegel et al. 1998).