NOTE: uvot_fluxes_wget.pl vrs. 2016-02-01 fem at 170518d19h49m24s207681usUT
NOTE: Used archived opt source position of 160.15317 -39.21217  3.00
NOTE: position reference is GCN_Circulars-21091

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

GRB 170510A: 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 170510A
695998 s after the LAT trigger (***Author*** et al., GCN Circ. ????).
No optical afterglow consistent with the optical position
(Lipunov et al. GCN Circ. 21091)
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

w1              695998       713476         5226         >22.4

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.07 in the direction of the burst
(Schlegel et al. 1998).