TITLE:   GCN CIRCULAR
NUMBER:  26097
SUBJECT: GRB 191029A: Swift/UVOT Upper Limits
DATE:    19/10/30 05:38:53 GMT
FROM:    Samantha Oates at MSSL  <sro@mssl.ucl.ac.uk>

S. R. Oates (U.Warwick) and P. A. Evans (U. Leicester)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 191029A
4.3 ks after the BAT trigger (Evans et al., GCN Circ. 26088).
No optical afterglow consistent with the XRT position
(Evans et al. GCN Circ. 26095)
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             4280        22783         1598         >22.1
v                 4691        15599         1082         >20.2
b                 5510        28520         2353         >21.7
u                 5305        21337         1082         >20.9
w1                5100        17046          723         >20.4
m2                4895        16504         1082         >20.6
w2                4486        11309          868         >20.7

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).