TITLE:   GCN CIRCULAR
NUMBER:  26199
SUBJECT: GRB 191106A: Swift/UVOT Upper Limits
DATE:    19/11/07 14:14:44 GMT
FROM:    Samantha Oates at MSSL  <sro@mssl.ucl.ac.uk>

S. R. Oates (U.Warwick) and F. E. Marshall (NASA/GSFC)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 191106A
132 s after the BAT trigger (Marshall et al., GCN Circ. 26177).
No optical afterglow consistent with the XRT position
(Page et al., GCN Circ. 26190) 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_FC          4987         5137          147         >20.0
u_FC               132          381          246         >20.1
white             4987         6775          541         >21.0
v                  437         7186          549         >19.9
b                  387        12533         1264         >21.3
u                  132        11621         1631         >20.8
w1                 486         7510          464         >20.0
m2                 461         7391          510         >20.0
w2                 412        13245         1223         >20.6

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.06 in the direction of the burst
(Schlegel et al. 1998).