GCN Circular 20159
Subject
GRB 161108A: Swift/UVOT Upper Limits
Date
2016-11-09T18:46:33Z (7 years ago)
From
Mike Siegel at PSU/Swift MOC <siegel@swift.psu.edu>
M. H. Siegel (PSU) and A. P. Beardmore (U. Leicester)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 161108A
90 s after the BAT trigger (Beardmore et al., GCN Circ. 20131).
No optical afterglow consistent with the XRT position
(Beardmore et al. GCN Circ. 20147) or the NOT position (Malesani et al.,
GCN Cir., 20146) 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) 90 239 147 >20.08
white 90 5617 344 >20.62
v 578 6029 235 >18.61
b 5212 5412 196 >19.76
u 248 498 245 >19.24
u 248 10794 652 >19.88
uvw1 628 6439 412 >19.66
uvm2 603 6234 412 >19.89
uvw2 554 5823 235 >19.59
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.02 in the direction of the burst
(Schlegel et al. 1998).