NOTE: uvot_fluxes_wget.pl vrs. 2024-08-27 fem at 241228d08h09m50s701119usUT
NOTE: Source region spec. is: 344.80175 18.61006 4"
NOTE: Used archived XRT position of 344.80175  18.61006  4.00
NOTE: position reference is GCN_Circulars-38681

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

GRB 241228A: Swift/UVOT Upper Limits

N. P. M. Kuin (UCL-MSSL) and V. D'Elia (SSDC & INAF-OAR)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 241228A
101 s after the BAT trigger (D'Elia et al., GCN Circ. 38681).
No optical afterglow consistent with the XRT position
*** POSITION REFERENCE is GCN_Circulars-38681 ***
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           101          251          147         >21.0
u_FC               314          564          246         >19.8
white              101         1538          392         >21.3
v                  644         1416           97         >19.1
b                  570         1514           97         >19.8
u                  314         1489          324         >20.0
w1                 694         1465           78         >19.2

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.091 in the direction of the burst
(Schlegel et al. 1998).