GCN Circular 23894
F. E. Marshall (NASA/GSFC) reports on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 190211A 203 s after the BAT trigger (Marshall et al., GCN Circ. 23883). A source consistent with the optical position (Xu et al. GCN Circ. 23884) and just outside the 90% confidence XRT position (Evans et al. GCN Circ. 23888) is detected in the only UVOT exposure. The preliminary UVOT position is: RA (J2000) = 13:06:38.45 = 196.66019 (deg.) Dec (J2000) = +41:58:04.9 = 41.96803 (deg.) with an estimated uncertainty of 0.53 arc sec. (radius, 90% confidence). The preliminary detection using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures is: Filter T_start(s) T_stop(s) Exp(s) Mag white 203 351 146 19.73 +/- 0.11 The magnitude in the table is 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).