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GCN Circular 5523

Subject
GRB060904A: Swift/UVOT optical observations
Date
2006-09-04T19:26:56Z (18 years ago)
From
Samantha Oates at MSSL <sro@mssl.ucl.ac.uk>
S.R. Oates (UCL-MSSL), D. Grupe (PSU) report on behalf of the 
Swift/UVOT team:

The Swift/UVOT began observing the field of GRB 060904A at
01:04:36 on 2006-09-04, 75 s after the BAT trigger (Grupe
et al., GCN 5502). No new source was detected within the XRT error 
circle
in coadded images in any filter down to the following 3-sigma
magnitude upper limits:


Filter  Tstart   Tstop   Exposure  3-sigma UL
-------------------------------------------------
V        55       1888     1680    20.11

B        658      1984     97      19.85

U        634      1959     117     19.49

UVW1     610      1936     117     19.91

UVM2     586      1911     117     19.95

UVW2     687      2014     128     20.55

White    75       1997     352.2   21.69
------------------------------------------------

These upper limits are not corrected for Galactic extinction
E(B-V) = 0.018.
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