TITLE:   GCN CIRCULAR
NUMBER:  8340
SUBJECT: GRB081007: Swift/UVOT Observations
DATE:    08/10/08 12:40:42 GMT
FROM:    Peter Brown at PSU  <pbrown@astro.psu.edu>

P. J. Brown (PSU) and W. H. Baumgartner (GSFC/UMGC)
report on behalf of the Swift/UVOT team:

The Swift/UVOT observed the field of GRB 081007
starting about 109 s after the BAT detection
(Baumgartner et al., GCN Circ. 8330).  We report additional
detections and 3 sigma upper limits of the fading afterglow
(where T_start and T_stop represent the
elapsed time since the BAT trigger in seconds).

Filter  T_start(s) T_stop  Exp(s)   Mag or 3 Sigma Limit
uvw2    725        1508    40       >18.8
uvm2    621        1394    59       >18.8
uvw1    646        1419    59       >19.3
u       670        1443    59       18.5 +/- 0.2
b       695        1468    39       19.1 +/- 0.2
v       215        615     394      17.5 +/- 0.1
v       969        1369    393      18.6 +/- 0.1
white   109        209     98       17.0 +/- 0.1
white   862        962     98       18.8 +/- 0.1

The above magnitudes are not corrected for the Galactic extinction
corresponding to a reddening of E(B-V) = 0.015 mag (Schlegel et al.,
1998, ApJS, 500, 525).  The photometry is on the UVOT photometric
system described in Poole et al. (2008, MNRAS, 383,627).