TITLE:   GCN CIRCULAR
NUMBER:  16990
SUBJECT: GRB 141028A: Swift/UVOT followup observations
DATE:    14/10/30 13:21:38 GMT
FROM:    Alice Breeveld at MSSL-UCL  <a.breeveld@ucl.ac.uk>

A. Breeveld (MSSL/UCL) and C. Pagani (U. Leicester) report on behalf of 
the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 141028A
31037 s after the LAT trigger (Bissaldi et al., GCN Circ. 16969).
A  fading source is detected in the initial exposures (Siegel and 
Pagani, GCN Circ., 16979) in the position given in that circular, also 
consistent with MASTER (Gorbovsky et a., GCN, Circ 16972), GROND (Graham 
et al., GCN Circ. 16977) and the XRT (Pagani, et al., GCN Circ 16986).

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

u                31037        31179          140         19.0+-0.18
u                69790        72355          2525        20.7+-0.13
u               105469       127705          4880        21.3+-0.18

The magnitudes in the table are not corrected for the Galactic 
extinction due to the reddening of E(B-V) = 0.05 in the direction of the 
burst (Schlegel et al. 1998).