GCN Circular 5519
Subject
GRB060904b: Optical observations with Swift/UVOT
Date
2006-09-04T14:50:10Z (18 years ago)
From
Samantha Oates at MSSL <sro@mssl.ucl.ac.uk>
S. R. Oates (UCL-MSSL), D. Grupe (PSU) on behalf of the Swift UVOT team
The Swift Ultra-Violet/Optical Telescope (UVOT) began observations of
GRB060904b at 02:32:14 UT, ~71 seconds after the initial Swift BAT trigger
(Grupe et al, GCN 5505). An optical counterpart was detected with the
V filter at a position RA(J2000)= (03h,52m,50.54s, -00o43'31.1'') to within 0.5''.
An optical afterglow was detected in V, B, U, UVW1, UVM2 and UVW2 filters.
The photometery results are given for the 6 filters below:
Filter Tstart Tstop Magnitudes and UL
---------------------------------------------
V 71 316 18.64 +/- 0.33
4732 4931 19.16 +/- 0.36
5960 6100 18.25 3 sigma UL
B 4322 4521 18.98 +/- 0.15
5550 5749 19.56 +/- 0.28
U 4117 4316 18.32 +/- 0.19
5346 5545 18.65 +/- 0.23
UVW1 3913 4112 18.78 +/- 0.31
5141 5340 19.11 +/- 0.36
UVM2 3708 3907 18.88 +/- 0.36
4936 5135 19.66 +/- 0.55
UVW2 4528 4727 18.96 +/- 0.33
5756 5955 19.32 +/- 0.41
---------------------------------------------
The values quoted above are not corrected for the expected
Galactic extinction of E_{B-V}=0.173.