TITLE: GCN CIRCULAR NUMBER: 12782 SUBJECT: GRB 111229A: Faulkes Telescope South observations DATE: 11/12/30 12:16:31 GMT FROM: Cristiano Guidorzi at Ferrara U,Italy C. Guidorzi (U. Ferrara), A. Melandri (INAF-OAB) report on behalf of the LJMU GRB group: The 2-m Faulkes Telescope South observed Swift GRB 111229A (Lien et al. GCN Circ. 12774) on December 30, from 10:08 UT, corresponding to 11.5 hours after the BAT trigger time. We clearly detect the optical afterglow (Nicuesa Guelbenzu et al. GCN Circ 12775; Cucchiara et al. GCN Circ. 12777) in the R filter and marginally in the i' filter with the following magnitude: Mid time from Total Exp Filter Magnitude Limit trigger (hr) (s) -------------------------------------------------------- 11.77 6x300 i' 21.6 +- 0.5 >20.9 12.34 6x300 R 21.4 +- 0.1 -------------------------------------------------------- Magnitudes are calibrated against nearby USNOB-1 stars. Comparing with GROND observations (Nicuesa Guelbenzu et al GCN 12775), we derive an average power-law decay index of about 0.8.