NOTE: uvot_fluxes_wget.pl vrs. 2024-08-27 fem at 250323d01h18m50s704949usUT
NOTE: Source region spec. is: 106.76050 7.19314 4"
NOTE: Used archived XRT position of 106.76050   7.19314  4.00
NOTE: position reference is GCN_Circulars-39841

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

GRB 250322A: Swift/UVOT Upper Limits

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

The Swift/UVOT began settled observations of the field of GRB 250322A
77 s after the BAT trigger (Gupta et al., GCN Circ. 39835).
No optical afterglow consistent with the XRT position
*** POSITION REFERENCE is GCN_Circulars-39841 ***
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            77          226          147         >20.6
u_FC               291          541          246         >19.7
white               77         1711          411         >20.8
v                  620         1760          136         >19.2
b                  546         1686          117         >19.7
u                  291         1661          343         >19.9
w1                 669         1807          134         >19.8
m2                 644         1785          136         >19.9
w2                 596         1736          136         >20.1

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.153 in the direction of the burst
(Schlegel et al. 1998).