NOTE: uvot_fluxes_wget.pl vrs. 2016-02-01 fem at 170202d06h16m02s960432usUT
NOTE: Used archived BAT position of 341.44700  64.00600
NOTE: position reference is GCN_Circ-20570

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

GRB 170131C: 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 170131C
78368 s after the BAT trigger (***Author*** et al., GCN Circ. ????).
No optical afterglow consistent with the BAT position
*** POSITION REFERENCE is GCN_Circ-20570 ***
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

w2               78368        96539         4888         >21.2

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 1.19 in the direction of the burst
(Schlegel et al. 1998).