[AAVSO-HEN] GRB080825B: Swift/UVOT Upper Limits

[grb at aavso.org]

The following is a GCN Circular circulated via the AAVSO network.
For an archive and more information on circulars visit:
http://lheawww.gsfc.nasa.gov/docs/gamcosray/legr/bacodine/gcn3_archive.html

TITLE:   GCN CIRCULAR
NUMBER:  8158
SUBJECT: GRB080825B: Swift/UVOT Upper Limits
DATE:    08/08/29 01:10:54 GMT
FROM:    Peter Brown at PSU  <pbrown at astro.psu.edu>

P. J. Brown (PSU) reports on behalf of the Swift/UVOT team:

The Swift/UVOT observed the field of GRB 080825B
starting about 45 ks after the SuperAGILE detection
(Evangelista et al., GCN Circ. 8133).  We do not detect
the optical afterglow seen by Thoene et al. (GCN Circ. 8135)
in any of the UVOT filters down to the following 3 sigma
upper limits.

Filter  T_start(s) T_stop  Exp(s)   MagLimit
white   49916      50823   885      >22.1
uvw2    44237      78448   1903     >21.5
uvm2    61477      67242   988      >20.8
uvw1    67248      73020   1036     >20.9
u       73027      73522   483      >20.8
b       49004      49911   885      >21.2
v       45144      61472   1234     >20.5

The above magnitudes are not corrected for the Galactic extinction
corresponding to a reddening of E(B-V) ~ 0.25 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).