TITLE:   GCN CIRCULAR
NUMBER:  43473
SUBJECT: GRB 260114A: Swift/UVOT Upper Limits
DATE:    26/01/20 17:04:02 GMT
FROM:    Mike Siegel at PSU/Swift MOC <mhs18@psu.edu>

M.H. Siegel (PSU) and R. A. J. Eyles-Ferris (U Leicester) report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 260114A 164 s after the BAT trigger (Eyles-Ferris et al., GCN Circ. 43396). No optical afterglow consistent with the XRT position (Beardmore et al., GCN Circ 43412) or the faint red counterpart (Li et al., GCN Circ. 43398; Volnova et al, GCN Circ. 43401) 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              164          848          102            >20.50
v                  705         1100           52            >18.44
b                  631          824           38            >19.22
u                  507          799          136            >19.56
uvw1               755          774           19            >17.70
uvm2               730          750           19            >17.28
uvw2               681         1080           58            >18.59

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.069 in the direction of the burst
(Schlegel et al. 1998)