GCN Circular 12597
Subject
GRB 111123A: Swift/UVOT Upper Limits
Date
2011-11-24T20:37:04Z (13 years ago)
From
Stephen Holland at USRA/NASA/GSFC/SSC <Stephen.T.Holland@nasa.gov>
S. T. Holland (CRESST/USRA/GSFC) and M. Stamatikos (OSU/NASA/GSFC)
report on behalf of the Swift/UVOT team:
The Swift/UVOT observed the field of GRB 111123A starting 90 s
after the BAT trigger (Stamatikos et al., 2011, GCNC 12587). Settled
observations started at 110 s. We do not detect an optical afterglow
at the location of the optical and near-infrared afterglow (Xu et al.,
2011, GCNC 12589; Fugazza et al., 2011, GCNC 12593) in any of the UVOT
filters. Preliminary 3-sigma upper limits for detecting a source in
the finding charts and in the co-added images, are
Filter TSTART TSTOP EXPOSURE Mag
---------------------------------------------------
white (FC) 110 260 147 >21.2
u (FC) 268 518 246 >20.3
white (FC) 871 934 62 >20.1
---------------------------------------------------
v 598 5999 430 >20.2
b 524 6711 325 >20.7
u 268 6614 678 >20.8
uvw1 647 6409 432 >20.6
uvm2 622 6204 432 >20.6
uvw2 573 5795 432 >20.9
white 110 5589 445 >21.7
---------------------------------------------------
The quoted magnitudes and upper limits have not been corrected
for the Galactic extinction along the line of sight to this burst of
E_{B-V} = 0.05 mag (Schlegel et al. 1998, ApJS, 500, 525).