GCN Circular 11531
Subject
GRB 110106A: Swift/UVOT Upper Limits
Date
2011-01-07T00:53:06Z (13 years ago)
From
Stephen Holland at USRA/NASA/GSFC/SSC <Stephen.T.Holland@nasa.gov>
S. T. Holland (CRESST/USRA/GSFC) and
V. Mangano (INAF-IASFP)
report on behalf of the Swift/UVOT team:
The Swift/UVOT observed the field of GRB 110106A starting 92 s
after the BAT trigger (Mangano, et al., 2011, GCN Circ. 11520).
Settled observations started at 110 s. We do no detect an optical
afterglow 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 T_start T_stop Exp(s) Mag
-----------------------------------------------
white (fc) 110 162 52 >20.2
3530 3680 150 >20.3
v 3687 16,046 1278 >20.3
b 4508 10,281 1082 >21.1
u 4302 5939 393 >20.4
uvw1 4097 5734 393 >20.2
uvm2 3892 5529 393 >20.1
uvw2 4918 11,717 706 >20.9
white 110 11,194 1280 >22.0
-----------------------------------------------
The quoted magnitudes and upper limits have not been corrected
for the expected Galactic extinction along the line of sight
corresponding to a reddening of E_{B-V} = 0.24 mag (Schlegel, et al.,
1998, ApJS, 500, 525). All photometry is on the UVOT photometry
system described in Poole et al. (2008, MNRAS, 383, 627).