NOTE: uvot_fluxes_wget.pl vrs. 2024-08-27 fem at 241025d07h47m08s960911usUT
NOTE: Source region spec. is: 333.65379 83.57565 3"
NOTE: Used archived uvot source position of 333.65379  83.57565  3.00
NOTE: position reference is GCN_Circ_37859
NOTE: A UVOT position was reported in GCN_Circ_37859
NOTE: Possible detection in wh at T+125.7

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

GRB 241025A: Swift/UVOT Upper Limits

N. J. Klingler (GSFC/UMBC/CRESTII) and Ambrosi (INAF-IASFPA)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 241025A
126 s after the BAT trigger (Ambrosi et al., GCN Circ. 37859).
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           126          275          147         >17.5
u_FC               339          589          246         >20.5
white              126         1371          372         >18.4
v                  671         5229          274         >19.4
b                  595         1347           78         >20.2
u                  339         1322          304         >20.5
w1                 722         5483          101         >21.0
m2                5234         5434          197         >20.2
w2                1030         1050           19         >19.5

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.249 in the direction of the burst
(Schlegel et al. 1998).


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

GRB 241025A: Swift/UVOT Detection

N. J. Klingler (GSFC/UMBC/CRESTII) and Ambrosi (INAF-IASFPA)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 241025A
126 s after the BAT trigger (Ambrosi et al., GCN Circ. 37859).
A source consistent with the XRT position
*** POSITION REFERENCE is GCN_Notice ***
is detected in the initial UVOT exposures.

The preliminary UVOT position is:
    RA  (J2000) =  22:14:36.83 = 333.65346 (deg.)
    Dec (J2000) = +83:34:32.2  =  83.57562 (deg.)
with an estimated uncertainty of 0.43 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              126          275          147         17.55 +/- 0.04
v                  671         5229          274        >19.4
b                  595         1347           78        >20.2
u                  339         1322          304        >20.5
w1                 722         5483          101        >21.0
m2                5234         5434          197        >20.2
w2                1030         1050           19        >19.5

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.249 in the direction of the burst
(Schlegel et al. 1998).