[vsnet-grb-info 2426] GRB051111: Swift/UVOT Observations
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Sat Nov 12 01:54:04 JST 2005
TITLE: GCN GRB OBSERVATION REPORT
NUMBER: 4263
SUBJECT: GRB051111: Swift/UVOT Observations
DATE: 05/11/11 16:51:52 GMT
FROM: Tracey Poole at MSSL <tsp at mssl.ucl.ac.uk>
T.S. Poole (UCL-MSSL), T. Sakamoto (GSFC), A.J. Blustin (UCL-MSSL), B.
Hancock (UCL-MSSL) & T.Kennedy (UCL-MSSL) on behalf of the Swift/UVOT team
report:
The Swift-Ultra-Violet/Optical Telescope (UVOT) began observing the field
of GRB 051111 (BAT Trigger=163438; Sakamoto et al. GCN 4248) at 2005-11-11
7:47:20, 5560 seconds after the burst. We detect a source in the V, B, U
and UVW1 filters at position RA 23:12:33.17, DEC 18:22:28.80; this
position was also reported by Mundell et. al. (GCN 4250). The source is
not detected in the UVM2 or UVW2 filters.
The aperture used for optical observations was 6 arcsec, and 12 arcsec was
used for the ultraviolet observations. The limiting magnitudes are given
to a 3 sigma limit.
Filter T_range T_exp Mag
(sec) (sec)
V 16298-17198 900 19.33+/-0.35 - source detection
B 11237-12136 900 20.38+/-0.35 - source detection
U 10329-11229 900 20.09+/-0.46 - source detection
UVW1 6467-7153 686 20.25+/-0.85 - source detection
UVM2 5560-11832 1800 20.92 - upper limit
UVW2 12145-12938 793 20.64 - upper limit
Where T_range is time post-trigger, and T_exp is the exposure time of the
observation. Magnitude errors include statistical and systematic errors.
These results were obtained from intital UVOT exposures, and the
observations of GRB051111 are continuing.
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