TITLE:   GCN CIRCULAR
NUMBER:  8893
SUBJECT: GRB 090205: Swift/UVOT Upper Limits
DATE:    09/02/06 16:54:59 GMT
FROM:    Wayne Landsman at GSFC/SSAI  <wayne.b.landsman@nasa.gov>

W. Landsman (NASA/GSFC) and M. Perri (ASDC) report on behalf of the 
Swift UVOT team

The Swift/UVOT began settled observations of the field of GRB 090205 92s 
after the BAT trigger (Perri et al., GCN 8884). We do not detect any 
source at the enhanced Swift XRT position (Evans et al. GCN 8885) or at 
the VLT optical candidate position (D'Avanzo et al. GCN 8887).     The 
UVOT non-detections are consistent with the spectroscopic redshift of 
4.6 reported by Thoene et al. (GCN 8889).    Our 3-sigma upper limits 
are reported below.

Filter   T_start   T_stop   Exp(s)  Mag (3-sigma upper limit)
-------------------------------------------------------------
white       92       242     148       > 21.1
white       92      7633     824       > 21.9
v          580     12829    1234       > 20.7
b          506     34930    2073       > 21.7
u          250       500     246       > 20.5
u          298     18581    1660       > 21.4
uvw1       629     17668    1415       > 21.4
uvm2       604     23148    1882       > 21.4
uvw2       555     11915    1322       > 21.5

The quoted upper limits have not been corrected for the expected 
Galactic extinction along the line of sight of E_(B-V) = 0.12 mag.   All 
photometry is on the UVOT photometric system described in Poole et al. 
(2008, MNRAS, 383, 627).