[vsnet-grb-info 2466] GRB051117b: No Swift/UVOT Detection

[GCN Circulars]

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  4303
SUBJECT: GRB051117b: No Swift/UVOT Detection
DATE:    05/11/24 15:11:02 GMT
FROM:    Tracey Poole at MSSL  <tsp at mssl.ucl.ac.uk>

T. S. Poole (UCL-MSSL), S. T. Holland (GSFC), D. Band (GSFC),
P. Boyd (GSFC-UMBC) & J. Nousek (PSU) on behalf of the Swift/UVOT team
report:

The Swift-Ultra-Violet/Optical Telescope (UVOT) began observing the
field of GRB 051117b (BAT Trigger=164279; Band et. al. GCN 4281) at
2005-11-17 13:22:54 UT, 133 seconds after the burst.

No new source is detected within the 4 arcsec radius XRT error circle at
position RA=5h 40m 43s, Dec=-19d 16' 26.2" (Beardmore et. al. GCN 4282)
in any of the UVOT filters down to the following co-added 5 sigma
magnitude upper limits:

Filter   T_range (sec)   Exp (sec)   5-sigma
V        133-24975       5236        20.53
B        499-1608        199         19.59
U        445-7019        311         19.66
UVW1     391-366901      1099        21.00
UVM2     277-5993        1110        21.08
UVW2     608-1713        2340        23.24
WHITE    553-982         100         19.49

Where T_range is time post-trigger, and T_exp is the exposure time of
the observation. A 6 arcsec aperture was used for all filters.

These values are not corrected for Galactic extinction.

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