GCN Circular 11531

Subject

GRB 110106A: Swift/UVOT Upper Limits

Event

Date

2011-01-07T00:53:06Z (15 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. 11520Loading...
 
 ).
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).