[vsnet-grb-info 18709] GRB 161105A: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  20157
SUBJECT: GRB 161105A: Swift/UVOT Upper Limits
DATE:    16/11/09 17:08:21 GMT
FROM:    Mike Siegel at PSU/Swift MOC  <siegel at swift.psu.edu>

M. H. Siegel (PSU) and K. L. Page (U. Leicester)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 161105A
586 s after the BAT trigger (Page et al., GCN Circ. 20131).
No optical afterglow consistent with the XRT position
(Osborne et al. GCN Circ. 20135)
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 initial exposures are:

Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

white (fc)         586          735          147         >20.44
white              586         5286          549         >21.11
v                 1046         7179          274         >18.86
b                  841         5081          274         >20.07
u                  816         1652           86         >18.62
uvw1               792        11242          713         >19.91
uvm2               767         7384          293         >19.12
uvw2              1022         6974          290         >19.24

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.33 in the direction of the burst
(Schlegel et al. 1998).