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TITLE: GCN GRB OBSERVATION REPORT
NUMBER: 4474
SUBJECT: GRB 060110a: RAPTOR detection of early optical emission.
DATE: 06/01/10 19:55:23 GMT
FROM: Przemyslaw R. Wozniak at LANL <wozniak@lanl.gov>
P.R. Wozniak, W.T. Vestrand, J. Wren, R. White, S. Evans of Los Alamos National
Laboratory report:
Our autonomous Raptor-S telescope responded to Swift trigger
176702 (Zane et al. GCN 4463) at 08:01:42.42 UT (6.8 seconds after receiving the
trigger). We clearly detect a fading optical source at the location of the IR
counterpart identified by Bloom et al.
(GCN 4471). The measurements show that the optical counterpart faded from
magnitude R=16.1+/-0.1 (5-second exposure) to about 17.5 over the first ten
minutes. Our unfiltered magnitudes were calibrated using R2 magnitudes of the
field sources in USNO B1.0 catalog.
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