NOTE: uvot_fluxes_wget.pl vrs. 2024-08-27 fem at 240907d08h26m34s306060usUT
NOTE: Source region spec. is: 268.000 +14.200 3"
NOTE: Used archived BAT position of 268.00000  14.20000
NOTE: position reference is GCN_Notice

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

GRB 240905: Swift/UVOT Upper Limits

***UBS*** (***INSTITUTION***) and ***BA*** (***BA INSTITUTION***)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 240905
165944 s after the LAT trigger (***Author*** et al., GCN Circ. ????).
No optical afterglow consistent with the LAT 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 initial exposures are:

Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

b               178215       178689          462         >20.5
u               177303       178210          885         >19.8
w1              166853       172571          877         >19.7
m2              165944       166844          886         >19.3

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.108 in the direction of the burst
(Schlegel et al. 1998).