TITLE:   GCN CIRCULAR
NUMBER:  6066
SUBJECT: GRB 070129: Swift/UVOT Upper limits
DATE:    07/01/31 15:31:00 GMT
FROM:    Margaret Chester at PSU  <chester@astro.psu.edu>

M. M. Chester (PSU) and O. Godet (U. Leicester) report on behalf
of the Swift UVOT team:

       The Swift/UVOT observed the field of GRB 070129 starting 124 s
after the BAT trigger (Godet et al. 2007, GCN Circ. 6053).  We do
not find any source, in any of the UVOT observations, inside the
refined XRT error circle (Godet et al., 2007 GCN Circ. 6056).

       The 3-sigma upper limits for detecting a source inside the XRT 
error circle in the V-band settling image, the finding-chart
exposures, and the co-added frames are:

Filter         T_start   T_stop    Exp(s)    Mag (3-sigma UL)
-----------------------------------------------------------------
V settling     124         133         9     17.3
V finding      247         647       400     19.2
V finding      979        1379       400     19.8
White finding  142         242       100     19.7
White finding  873         973       100     20.0

V              124       47339      3046     20.7
B              726       53670      3073     21.4
U              701       53414      5398     21.3
UVW1           678       52501      4895     22.2
UVM2           653       58021      3956     22.0
UVW2           754       46426      2239     22.0
White          143       13183      1460     20.8
-----------------------------------------------------------------

The values quoted above are not corrected for the expected Galactic
extinction corresponding to a reddening of E_{B-V} = 0.14 mag towards
the direction of the burst (Schlegel et al. 1998).