[vsnet-grb-info 6997] GRB081128: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  8581
SUBJECT: GRB081128: Swift/UVOT Upper Limits
DATE:    08/11/29 21:22:41 GMT
FROM:    Peter Brown at PSU  <pbrown at astro.psu.edu>

P. J. Brown (PSU) and R. Margutti (Univ. Biococca & OAB)
report on behalf of the Swift UVOT team:

The Swift/UVOT observed the field of GRB 081128 starting 206 s
after the BAT trigger (Margutti et al., GCN Circ. 8571).
We do not detect any source inside the UVOT-enhanced XRT
error circle (Evans, et al., GCN Circ. 8573)
down to the following 3-sigma upper limits in the
finding chart and co-added images:

Filter     T_start   T_stop    Exp(s)  Mag
------------------------------------------
  white       207      356      150   >20.9

  white       207      959      308   >21.3
     v        363     5643      247   >19.4
     b        462      826       58   >19.6
     u        437      801       58   >19.3
   uvw1       413      777       58   >19.0
   uvm2       388      752       58   >18.6
   uvw2       512     4429      236   >19.9

   white    10015    34512      625   >21.4
     v      27370    75499     3535   >21.0
-----------------------------------------

The quoted upper limits have not been corrected for the expected
Galactic extinction along the line of sight corresponding to a
reddening of E(B-V) = 0.05 mag (Schlegel, et al., 1998, ApJS, 500,
525).  All photometry is on the UVOT photometry system described in
Poole et al. (2008, MNRAS, 383, 627).