TITLE:   GCN CIRCULAR
NUMBER:  16918
SUBJECT: GRB 141015A: Swift/UVOT Upper Limits
DATE:    14/10/16 12:56:09 GMT
FROM:    Alice Breeveld at MSSL-UCL  <a.breeveld@ucl.ac.uk>

A. A. Breeveld (UCL-MSSL) and E. Troja (NASA/GSFC/UMCP) report on behalf 
of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 141015A 
21301 s after the BAT trigger (Troja et al., GCN Circ. 16909).
No optical afterglow consistent with the XRT position (Evans et al. GCN 
Circ. 16913) 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         21301        21451          147         >20.5
white            21301        23280         1033         >21.5
v                27071        27978          885         >19.8
b                21461        22368          885         >20.8
w1               28890        29661          759         >20.1
m2               27983        28883          886         >20.3
w2               23286        23906          610         >20.1

The magnitudes in the table are not corrected for the Galactic 
extinction due to the reddening of E(B-V) = 0.51 in the direction of the 
burst (Schlegel et al. 1998).