GCN Circular 21353

F. E. Marshall (NASA/GSFC) 
reports on behalf of the Swift/UVOT team:

Some of the Swift UVOT exposures of GRB 170714A
previously reported by Marshall and D'Ai (GCN Circular 21351
Not found
 
 
)
contain readout streaks due to nearby bright sources.
These streaks make the determination of magnitudes very difficult,
and this effect was not accounted for in the previous analysis.
The affected exposures have been removed from the corrected
table given below. As a result, the most significant detection
of a source with UVOT has been removed, and there is now
only weak evidence for a UVOT source at the position of
the z-band afterglow candidate reported by
de Ugarte Postigo et al. (GCN Circ. 21346
Not found
 
 
).

Preliminary detections and 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
v                  397         1695          175         >18.6
b                  496         1644          155         20.0 +/- 0.33
b                92917        93309          382         >20.3
u                  471         1619          284         20.1 +/- 0.35
u                81432        92912         1509         >20.7
w1                 446         1594          136         >21.0
m2               76276        98985         2438         >21.3
w2               74458        86274         1771         >21.5

I apologize for any confusion caused by the earlier report.