GCN Circular 3859
Subject
GRB050822: Swift/UVOT upper limits
Date
2005-08-22T20:10:52Z (19 years ago)
From
Alexander Blustin at MSSL-UCL <ajb@mssl.ucl.ac.uk>
M. J. Page, H. Ziaeepour, A. J. Blustin (UCL-MSSL), M. Chester (PSU),
R. Fink (GSFC), N. Gehrels (GSFC) on behalf of the Swift UVOT team
The Swift/UVOT began observing the field of GRB050822 at 03:51:47,
138 s after the BAT trigger (Blustin et al., GCN 3849). No new source
(with respect to the DSS image) is observed at the XRT position in
summed images from any of the six filters down to the following
3-sigma magnitude upper limits:
Filter T_range (s) Exp (s) 3-sig UL (mag)
V 138-1090 278 19.5
B 284-1453 135 19.7
U 270-1402 188 19.4
UVW1 257-1298 188 20.0
UVM2 242-1194 188 20.6
UVW2 300-986 88 20.0
Where T_range is the time range post-trigger over which images were
co-added.
The magnitudes have not been corrected for extinction. These
magnitudes are based on preliminary zero-points, measured in orbit,
and will require refinement with further calibration.