[vsnet-grb-info 18216] GRB 160705B: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  19664
SUBJECT: GRB 160705B: Swift/UVOT Upper Limits
DATE:    16/07/06 20:47:42 GMT
FROM:    Sam Emery at MSSL-UCL  <samuel.emery.15 at ucl.ac.uk>

S.W.K. Emery (UCL-MSSL) 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 160705B
149 s after the BAT trigger (Cannizzo et al., GCN Circ. 19657).
No optical afterglow consistent with the XRT position (Osborne et al. GCN Circ. 19659)
or the LT and RATIR position (Guidorzi et al. GCN 19658; Watson et al. GCN Circ. 19663)
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           149          298          147         >20.6
u_FC               307          557          246         >19.9
white             4780         6415          393         >21.0
v                 5191        11327         1082         >19.9
b                 6011         6210          197         >20.1
w1               12239        12529          285         >20.0
m2               11333        12232          886         >20.7
w2                6421         6603          179         >19.9

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.01 in the direction of the burst
(Schlegel et al. 1998).