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TITLE: GCN GRB OBSERVATION REPORT
NUMBER: 5539
SUBJECT: GRB 060906: Early RAPTOR optical limits
DATE: 06/09/06 22:01:25 GMT
FROM: James Wren at LANL <jwren@nis.lanl.gov>
J. Wren, W.T. Vestrand, P.R. Wozniak, R. White, S. Evans, and J. Pergande of Los
Alamos National Laboratory report:
The RAPTOR array of telescopes autonomously responded to Swift trigger 228316.
Conditions were cloudy at our primary telescope site but our wide-field RAPTOR-B
small telescope array, located at our secondary site, imaged the event under
clear conditions.
Imaging began at 08:34:12.53 UTC (86.0 s after the trigger, 5.8 s after
receipt). We do not detect the counterpart seen by the Swift XRT (Racusin et al.
GCN 5528) and P60 (Cenko et al. GCN 5529).
The initial unfiltered 5 s exposure yields a 3-sigma limiting magnitude at the
counterpart location of R=15.2 when calibrated against the GSC 1.1 R-band. This
limit has not been corrected for foreground galactic extinction.
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