TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  5540
SUBJECT: GRB 060906: optical observation
DATE:    06/09/06 23:23:23 GMT
FROM:    Ken ichi Torii at Osaka U  <torii@ess.sci.osaka-u.ac.jp>

K. Torii (Osaka U.) reports:

 The error region of GRB 060906 (Racusin et al. GCN 5528) was observed
with the 0.3m telescope in the New Mexico Skies Observatory.  Starting
at 08:39:08 UT (6.4 minutes after the trigger), 120s x 20 frames were
acquired through Ic filter.

 At the position of the optical afterglow (Cenko et al. GCN 5529,
5531), we identify a marginal excess (at 3.2 sigma) that corresponds
to I=17.7 (USNO-B1.0 magnitude) in a stacked frame (120s x first 10
frames). The analysis is preliminary.

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