TITLE:   GCN CIRCULAR
NUMBER:  7592
SUBJECT: GRB 080411: Swift/UVOT refined analysis
DATE:    08/04/12 15:22:49 GMT
FROM:    Andy Beardmore at U Leicester  <apb@star.le.ac.uk>

S. R. Oates and F. Marshall report on behalf of the Swift/UVOT team.

The Swift/UVOT observed the field of GRB 080411 starting at 4202s
after the BAT trigger (Marshall et al., GCN 7584).  We detect the
afterglow in white, v, b, u and uvw2 filters at the position:

RA(J2000.0)  =  02:31:55.19
DEC(J2000.0) = -71:18:07.30

with an etimated uncertainty of 0.5 arcsec (radius, 90% confidence).
This position is consistent with the optical afterglow position
reported by GROND (Kruehler et al., GCN 7586). The UVOT did not
perform observations in uvw1 and uvm2 filters. The following
magnitudes were obtained:

Filter    T_Mid(s)   Expo(s)            Magnitude
-----------------------------------------------------
White      4251        98              17.01 +/- 0.03
White      22869       295             18.09 +/- 0.03
v          16808       177             18.05 +/- 0.12
b          4615        197             17.43 +/- 0.05
b          21653       295             18.39 +/- 0.09
u          4410        197             16.46 +/- 0.04
uvw2       16260       886             18.41 +/- 0.07
-----------------------------------------------------

The above magnitudes are not corrected for the Galactic extinction
corresponding to a reddening of E_{B-V} = 0.04 mag (Schlegel et al.,
1998, ApJS, 500, 525). The photometry is on the UVOT flight system
described in Poole et al.  (2008, MNRAS, 383, 627).