NOTE: uvot_fluxes_wget.pl vrs. 2024-08-27 fem at 241209d18h42m01s955486usUT
NOTE: Source region spec. is: 155.39646 6.32872 4"
NOTE: Used archived XRT position of 155.39646   6.32872  4.00
NOTE: position reference is GCN_Circulars-38486

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

GRB 241209A: Swift/UVOT Upper Limits

N. J. Klingler (GSFC/UMBC/CRESTII) and T. M. Parsotan (GSFC)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 241209A
110 s after the BAT trigger (Parsotan et al., GCN Circ. 38476).
No optical afterglow consistent with the XRT position
*** POSITION REFERENCE is GCN_Circulars-38486 ***
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           110          260          147         >20.3
u_FC               323          573          246         >20.1
white              110         1375          373         >21.0
v                  653         1425           97         >19.6
b                  579         1350           78         >19.9
u                  323         1325          304         >20.2
w1                1108         1474           58         >18.4

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.024 in the direction of the burst
(Schlegel et al. 1998).