GCN Circular 3759
Subject
GRB050803: Optical/UV Upper Limits from Swift-UVOT
Date
2005-08-04T17:06:57Z (19 years ago)
From
Peter Brown at PSU <pbrown@astro.psu.edu>
GRB050803: Optical/UV Upper Limits from Swift-UVOT
P. J. Brown (PSU), D.L. Band (GSFC-UMBC),
P. Boyd (GSFC-UMBC), J. Norris (GSFC),
K. Hurley (Berkeley), N. Gehrels (GSFC),
report on behalf of the Swift-UVOT Team:
Swift detected and slewed immediately to the
position of GRB050803 (trigger=148833;
Band et al. GCN 3748). UVOT began settled
observations at 19:17:05.2 UT, 185 seconds
after the trigger. No sources are detected
within the revised XRT error circle
(Racusin et al GCN 3752) in any of our images.
The following are 3 sigma upper limits at the
indicated epochs.
Filter Tmid(sec) Tmid(h) Exp(sec) UppLim(3-sigma)
V 235.09 0.07 99.78 18.8
V 365.14 0.1 9.76 17.5
V 1357.88 0.38 99.72 18.5
V 11900.74 3.31 899.76 20.0
B 336.31 0.09 9.77 18.5
B 1148.34 0.32 99.77 19.7
B 6919.71 1.92 693.82 20.7
B 18490.49 5.14 695.69 20.7
U 322.1 0.09 9.76 18.3
U 1043.66 0.29 99.77 19.5
U 6115.3 1.7 899.77 20.7
U 17685.21 4.91 899.77 20.7
UVW1 308.4 0.09 9.79 18.7
UVW1 5208.39 1.45 899.77 21.1
UVW1 16778.3 4.66 899.76 21.1
UVM2 294.29 0.08 9.79 18.5
UVM2 1446.35 0.4 68.22 19.5
UVM2 12705.06 3.53 694.85 20.9
UVW2 351.49 0.1 9.78 19.4
UVW2 1253.64 0.35 99.77 20.2
UVW2 10993.89 3.05 899.78 21.5
In addition, no sources are detected within the
XRT error circle when the above images are summed
together, including those reported by Bloom et al
(GCN 3758) and Berger et al (GCN 3753).
These magnitudes are based on preliminary zero-points,
measured in orbit, and will require refinement with
further calibration.