TITLE:   GCN CIRCULAR
NUMBER:  10867
SUBJECT: GRB 100619A: Swift/UVOT Upper Limits
DATE:    10/06/19 13:15:56 GMT
FROM:    Peter Curran at MSSL  <pac@mssl.ucl.ac.uk>

P.A. Curran (MSSL-UCL) and J. K. Cannizzo (NASA/UMBC) report on behalf
of the Swift/UVOT team:


The Swift/UVOT began settled observations of the field of GRB 100619A 87 
s after the BAT trigger (Cannizzo et al., GCN Circ. 10863). No optical 
afterglow consistent with the enhanced  XRT position (Beardmore et al., 
GCN Circ. 10865) is detected in the initial UVOT exposures. Preliminary 
3-sigma upper limits using the UVOT photometric system (Poole et al. 
2008, MNRAS, 383, 627) for the first finding chart (FC) and subsequent 
exposures are:


Filter   T_start(s)  T_stop(s)  Exp(s)   Mag
-----------------------------------------------
white    87          237        147      >21.2 (FC)
u        300         549        246      >20.5 (FC)

white    87          6773       785      >22.0
v        630         7184       510      >20.2
b        556         13220      1161     >21.5
u        300         19002      2089     >21.6
w1       679         18300      2128     >21.7
m2       654         17394      1396     >21.4
w2       606         6978       510      >20.9


The values quoted above are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.03 in the direction of the burst
(Schlegel et al. 1998).