[vsnet-grb-info 4165] GRB 061222B: Swift/UVOT Upper limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  5972
SUBJECT: GRB 061222B: Swift/UVOT Upper limits
DATE:    06/12/22 17:47:43 GMT
FROM:    Shashi Pandey at MSSL  <sbp2 at mssl.ucl.ac.uk>

S. B. Pandey (UCL-MSSL), J. L. Racusin (PSU), S. R. Oates (UCL-MSSL)
report on the behalf of the Swift UVOT team:


The Swift/UVOT observed the field of  GRB061222B starting 136 sec
after the BAT trigger (GCN Circ. 5957). We do not detect the afterglow
candidate reported in GCN Circ.5956 in our V band exposures. This is in
accordance with the observed redshift of z=3.355 (GCN Circ. 5962) for
the burst.

The determined 3-sigma upper limits for V band settling, finding-chart
exposures and for the co-added frames of the observed UVOT filters are:

Filter         T_start   T_stop    Exp(s)    Mag (3-sigma upper limit)
-----------------------------------------------------------------
V settling     136       145       9         17.29
V finding      146       546       393       19.77

V              136       890       475       19.86
B              624       4884      141       20.29
U              600       4755      235       19.98
UVW1           576       4551      255       19.76
UVM2           552       4346      255       19.96
UVW2           640       794       38        18.64
-----------------------------------------------------------------

The values quoted above are not corrected for the expected Galactic
extinction of E_{B-V} = 0.38 mag towards the burst direction
(Schlegel et al. 1998).