NOTE: uvot_fluxes_wget.pl vrs. 2016-02-01 fem at 160817d19h27m08s820386usUT
NOTE: Used archived opt source position of 322.41062  37.13300  3.00
NOTE: position reference is GCN_Circulars-19809
NOTE: Possible detection in uu at T+25222.2
NOTE: Possible detection in wh at T+37530.1 sum

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

GRB 160816A: Swift/UVOT Upper Limits

N. P. M. Kuin (UCL-MSSL) and L. M. Z. Hagen (***BA INSTITUTION***)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 160816A
25222 s after the LAT trigger (***Author*** et al., GCN Circ. ????).
No optical afterglow consistent with the optical position
(Troja et al. GCN Circ. 19809)
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

white            27601        49139          953         >21.1
v                27661        27703           41         >18.2
u                25222        49056         3847         >20.8

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.25 in the direction of the burst
(Schlegel et al. 1998).


=========== Draft Detection Circular ========

GRB 160816A: Swift/UVOT Detection

N. P. M. Kuin (UCL-MSSL) and L. M. Z. Hagen (***BA INSTITUTION***)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 160816A
25222 s after the LAT trigger (***Author*** et al., GCN Circ. ????).
A source consistent with the optical position
(Troja et al. GCN Circ. 19809)
is detected in the initial UVOT exposures.

Preliminary detections and 3-sigma upper limits using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are: 

Filter         T_start(s)   T_stop(s)      Exp(s)           Mag

white            27601        43846          879         21.57 +/- 0.20
v                27661        27703           41        >18.2
u                25222        43265         3079         21.28 +/- 0.20

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.25 in the direction of the burst
(Schlegel et al. 1998).