GCN Circular 5972
Subject
GRB 061222B: Swift/UVOT Upper limits
Date
2006-12-22T17:47:43Z (17 years ago)
From
Shashi Pandey at MSSL <sbp2@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).