NOTE: uvot_fluxes_wget.pl vrs. 2023-03-23 fem at 240826d09h59m39s028809usUT
NOTE: Source region spec. is: 344.57192 1.02686 3"
NOTE: Used archived uvot source position of 344.57192   1.02686  3.00
NOTE: position reference is GCN_Circ_37274
NOTE: A UVOT position was reported in GCN_Circ_37274
NOTE: Possible detection in w1 at T+1261.1 sum
NOTE: Possible detection in wh at T+93.0
NOTE: Possible detection in uu at T+305.4
NOTE: Possible detection in bb at T+560.6
NOTE: Possible detection in vv at T+635.0

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

GRB 240825A: Swift/UVOT Upper Limits

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

The Swift/UVOT began settled observations of the field of GRB 240825A
93 s after the BAT trigger (Gupta et al., GCN Circ. 37274).
No optical afterglow consistent with the XRT position
*** POSITION REFERENCE is GCN_Circulars-37290 ***
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            93          243          147         >15.5
u_FC               305          555          246         >16.8
white               93         1181          353         >16.5
v                  635         1231           78         >16.9
b                  561         1156           58         >17.7
u                  305         1297          296         >16.9
w1                 684         1281           58         >17.9

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.063 in the direction of the burst
(Schlegel et al. 1998).


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

GRB 240825A: Swift/UVOT Detection

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

The Swift/UVOT began settled observations of the field of GRB 240825A
93 s after the BAT trigger (Gupta et al., GCN Circ. 37274).
A source consistent with the XRT position
*** POSITION REFERENCE is GCN_Circulars-37290 ***
is detected in the initial UVOT exposures.

The preliminary UVOT position is:
    RA  (J2000) =  22:58:17.26 = 344.57192 (deg.)
    Dec (J2000) = +01:01:36.9  =   1.02691 (deg.)
with an estimated uncertainty of 0.42 arc sec. (radius, 90% confidence).

Preliminary detections 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               93          243          147         15.58 +/- 0.02
v                  807          827           20         17.02 +/- 0.20
b                  561          580           20         17.54 +/- 0.15
u                  305          555          246         16.93 +/- 0.05
w1                 684         1281           58         18.55 +/- 0.30

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.063 in the direction of the burst
(Schlegel et al. 1998).