[vsnet-grb-info 18742] GRB 161117B: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  20191
SUBJECT: GRB 161117B: Swift/UVOT Upper Limits
DATE:    16/11/17 23:07:40 GMT
FROM:    Frank Marshall at GSFC  <femarsha at khamseen.gsfc.nasa.gov>

F. E. Marshall (NASA/GSFC) 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 161117B
84 s after the BAT trigger (Troja et al., GCN Circ. 20182).
No optical afterglow consistent with the XRT position
(Osborne et al. GCN Circ. 20186)
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            84          234          147         >21.1
u_FC               296          546          246         >20.3
white               84         1026          334         >21.4
v                  626          820           39         >18.1
b                  552          745           39         >19.6
u                  296          720          265         >20.3
w1                 676          870           39         >18.9
m2                 651          844           39         >19.9
w2                 602         1050           57         >19.6

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.10 in the direction of the burst
(Schlegel et al. 1998).