GCN Circular 8747
Subject
GRB 081228: Swift/UVOT Upper Limits
Date
2008-12-28T16:00:24Z (15 years ago)
From
Wayne Landsman at GSFC/SSAI <wayne.b.landsman@nasa.gov>
W. Landsman (GSFC) and K. L. Page (U. Leicester) report on behalf of the
Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 081228 82s
after the BAT trigger (Page et al., GCN 8742).
The exposure time was limited by observing constraints until about 1
hour after the trigger. We do not detect any source at the refined
Swift XRT position (Page & Evans GCN 8746). UVOT magnitude 3-sigma
upper limits in a 5" aperture are reported in the following table:
Filter T_start Exp(s) Mag (3-sigma upper limit)
------------------------------------------------------
white 82 37 > 20.0
white 4679 137 > 20.7
v 3653 197 > 19.3
b 4473 197 > 20.3
u 4268 197 > 20.0
uvw1 4063 197 > 20.0
uvm2 3858 197 > 20.0
uvw2 9102 886 > 20.9
The quoted upper limits have not been corrected for the expected
Galactic extinction along the line of sight of E_(B-V) = 0.16 mag. All
photometry is on the UVOT photometric system described in Poole et al.
(2008, MNRAS, 383, 627).