TITLE:   GCN CIRCULAR
NUMBER:  9407
SUBJECT: GRB 090519: Swift/UVOT Upper Limits
DATE:    09/05/20 03:27:00 GMT
FROM:    Stefan Immler at NASA/GSFC  <stefan.m.immler@nasa.gov>

S. Immler (NASA/CRESST/GSFC) and M. Perri (ASDC) report on
behalf of the Swift/UVOT team:

The Swift/UVOT observed the field of GRB 090519 starting 106 s after
the BAT trigger (Perri et al., GCN Circ. 9400). No optical afterglow
is detected in the initial UVOT exposures at the enhanced position
of the X-ray afterglow (Goad et al., GCN Circ. 9405) or the position
of the NOT afterglow candidate (Thoene et al. GCN Circ. 9403).
Three-sigma upper limits using the UVOT photometric system
(Poole et al. 2008, MNRAS, 383, 627) are:

Filter          T_start(s)   T_stop(s)      Exp(s)        Mag

white              123         7430          862         >21.5
v                  106         7841          597         >19.8
b                  536         7224          568         >20.6
u                  281         7019          617         >20.4
uvw1               662         8131          469         >20.3
uvm2               637         8046          587         >20.4
uvw2               588         7636          549         >20.6

The values quoted above are not corrected for the Galactic extinction due
to the reddening of E(B-V) = 0.04 in the direction of the burst
(Schlegel et al. 1998).