TITLE: GCN CIRCULAR NUMBER: 12465 SUBJECT: GRB 111020A: Faulkes Telescope South observations DATE: 11/10/20 16:07:13 GMT FROM: Nial Tanvir at U.Leicester C. Guidorzi (U. Ferrera), N. R. Tanvir (U. Leicester), C. Mottram, D. Bersier (Liverpool JMU), report: On 2011 October 20 at 11:02:37 UT the 2-m Faulkes Telescope South began observing short GRB 111020A (Sakamoto et al., GCN Circ. 12460) using the Ri filters, corresponding to approximately 4.5 hours after the burst trigger time. We detect no uncatalogued sources, either inside or near the enhanced XRT error circle (Osborne et al. GCN Circ. 12463), to the following limiting magnitudes: Mid time from Total Exp Filter Magnitude trigger (hours) (s) ------------------------------------------------ 4.75 6x300 R> 21.0 5.32 6x300 i> 21.7 ------------------------------------------------ Magnitudes have been calibrated from nearby USNOB-1 stars using their R2 and I nominal values.