NOTE: uvot_fluxes_wget.pl vrs. 2023-03-23 fem at 230707d23h47m43s752297usUT
NOTE: Source region spec. is: 171.4759 -21.5125 3"
NOTE: Used archived BAT position of 171.47590 -21.51250
NOTE: position reference is GCN_Circ-34159

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

GRB 230707A: Swift/UVOT Upper Limits

S. J. LaPorte (PSU) and S. L. Laha (***BA INSTITUTION***)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 230707A
32804 s after the BAT trigger (***Author*** et al., GCN Circ. ????).
No optical afterglow consistent with the BAT position
*** POSITION REFERENCE is GCN_Circ-34159 ***
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

u                32804        50959         4600         >21.2

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.048 in the direction of the burst
(Schlegel et al. 1998).