TITLE: GCN CIRCULAR NUMBER: 12635 SUBJECT: GRB 111209A: Faulkes Telescope North observations DATE: 11/12/09 10:29:53 GMT FROM: Cristiano Guidorzi at Ferrara U,Italy C. Guidorzi (U. Ferrara), A. Melandri (INAF-OAB), S. Kobayashi, C.G. Mundell (LJMU), A. Gomboc (U. Ljubljana) report on behalf of the LJMU GRB group: The 2-m Faulkes Telescope North robotically followed up Swift GRB 111209A (Hoversten et al. GCN Circ. 12632) from 07:20:00 UT, corresponding to 7.9 minutes after the BAT trigger time. Within the XRT error circle we clearly detect the optical afterglow in the i' filter reported by Klotz et al. (GCN 12633) and Fugazza et al. (GCN 12634) with the following magnitude: Mid time from Total Exp Filter Magnitude trigger (s) (s) ------------------------------------------------- 697 30 i' 18.3 +- 0.2 ------------------------------------------------- Magnitude has been calibrated from I nominal values of nearby USNOB1.0 stars.