[vsnet-grb-info 6620] GRB080913: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  8224
SUBJECT: GRB080913: Swift/UVOT Upper Limits
DATE:    08/09/13 16:40:12 GMT
FROM:    Samantha Oates at MSSL  <sro at mssl.ucl.ac.uk>

S. R. Oates and P. Schady report on behalf of the Swift/UVOT team.

The Swift/UVOT began settled observations of the field of GRB 080913 
starting
105s after the BAT trigger (Schady et al., GCN 8217). We do not detect an
afterglow in any of the UVOT filters inside the UVOT-enhanced XRT
error circle (Beardmore et al., GCN 8219).

The 3 sigma upper limits for the finding charts (fc) and summed images
are given below:

Filter    T_start(s)  T_stop(s)  Expo(s)  Magnitude (3 sigma UL)
-----------------------------------------------------------------
White (fc)   105        205        98           >20.92
White        105       1964        238          >21.26                 
v (fc)       211        611        393          >20.08
v            211       1858        865          >20.39
b            691       1957        97           >19.62
u            666       1932        117          >19.36
w1           641       1907        117          >19.48
m2           616       1882        78           >18.84
w2           721       1833        58           >18.99
----------------------------------------------------------------

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).