NOTE: A UVOT position was reported in GCN_Circ_19333
NOTE: Possible detection in uu at T+32624.3
NOTE: Possible detection in wh at T+33426.7
NOTE: Possible detection in vv at T+39970.1

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

GRB 160422A: Swift/UVOT Upper Limits

F. E. Marshall (NASA/GSFC) and J. K. Cannizzo (***BA INSTITUTION***)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 160422A
32624 s after the LAT trigger (***Author*** et al., GCN Circ. ????).
No optical afterglow consistent with the XRT position
(Maselli et al. GCN Circ. 19334)
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            33427        45701         2195         >19.6
v                39970        45820          320         >18.7
u                32624        44897         2351         >19.1

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.02 in the direction of the burst
(Schlegel et al. 1998).


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

GRB 160422A: Swift/UVOT Detection

F. E. Marshall (NASA/GSFC) and J. K. Cannizzo (***BA INSTITUTION***)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 160422A
32624 s after the LAT trigger (***Author*** et al., GCN Circ. ????).
A source consistent with the XRT position
(Maselli et al. GCN Circ. 19334)
is detected in the initial UVOT exposures.

The preliminary UVOT position is:
    RA  (J2000) =  02:48:22.78 =  42.09493 (deg.)
    Dec (J2000) = -57:52:30.4  = -57.87512 (deg.)
with an estimated uncertainty of 0.45 arc sec. (radius, 90% confidence).

Preliminary detections 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            33427        34064          627         19.50 +/- 0.05
v                39970        45820          320         19.29 +/- 0.23
u                32624        33420          783         19.09 +/- 0.10

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.02 in the direction of the burst
(Schlegel et al. 1998).