TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2794 SUBJECT: GRB 041006 Optical afterglow observations DATE: 04/10/10 05:03:27 GMT FROM: Shashi Bhushan Pandey at State Obs.Nainital,India Kuntal Misra and S. B. Pandey (ARIES NainiTal), on behalf of larger Indian GRB collaboration We observed several R_c band frames of the GRB 041006 optical afterglow, determined the magnitudes in comparison with the stars A and B as reported in GCN 2792 using 1.04-m telescope of ARIES Nainital India. The OT decayed by ~ 0.5 mag from Oct 6.75 to Oct 6.91 UT. Preliminary R_c - band magnitudes are: Oct 6.776284 19.81 0.05 Oct 6.830509 20.00 0.05 Oct 6.862395 20.02 0.05 Oct 6.877175 20.18 0.06 The temporal flux decay index is ~ -1.0. We did not notice any considerable steepening in the light curve using our data set. This massage may be cited.