TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2779 SUBJECT: GRB 041006 : optical observation at Bisei DATE: 04/10/07 10:14:19 GMT FROM: Hitoshi Yamaoka at Kyushu U., VSNET-GRB collab. K. Ayani (Bisei Astronomical Observatory (BAO)) and H. Yamaoka (Kyushu Univ.) report: We obtained R-band images of the optical afterglow (da Costa, Noel and Price, GCN 2765) of GRB 041006 (Galassi et al., GCN 2770) with the BAO 1.01-m reflector. The observation started on 16:44 UT. The stacked image (mean epoch = Oct. 6.71 UT) shows the OT of which a preliminary R magnitude is about 19.2, compared with the USNO A2.0 red magnitudes. This message may be cited.