TITLE:   GCN CIRCULAR
NUMBER:  8799
SUBJECT: GRB 090111: Swift UVOT Upper Limits
DATE:    09/01/12 19:11:09 GMT
FROM:    Erik Hoversten at Swift/Penn State  <hoversten@astro.psu.edu>

E. A. Hoversten (PSU) and T. Sakamoto (NASA/UMBC) report on behalf of
the Swift UVOT team:

The Swift/UVOT began settled observations of the field of
GRB 090111 86s after the BAT trigger (Godet et al., GCN 8795).
We do not detect any source at the enhanced Swift XRT position (Evans
et al. GCN 8796).  UVOT magnitude 3-sigma upper limits are reported in
the following table:

Filter   T_start   T_stop   Exp(s)  Mag (3-sigma upper limit)
-------------------------------------------------------------
WHITE       86       235     146       > 20.25
WHITE       86      1545     391       > 20.78
v          627      1768     136       > 18.47
b          553      1866     136       > 19.37
u          298       547     245       > 19.56
u          298      1841     608       > 20.03
uvw1       676      1817     136       > 19.22
uvw2       603      1743     136       > 19.52

The quoted upper limits have not been corrected for the expected
Galactic extinction along the line of sight of E_(B-V) = 0.16 mag.
All photometry is on the UVOT photometric system described in Poole et
al. (2008, MNRAS, 383, 627).