TITLE: GCN CIRCULAR NUMBER: 14840 SUBJECT: GRB 130606A - Liverpool Telescope and Faulkes Telescope North optical observations DATE: 13/06/09 21:43:42 GMT FROM: Francisco Virgili at Liverpool John Moores U F.J. Virgili, C.G. Mundell (LJMU), A. Melandri (INAF-OAB), and A. Gomboc (U. Ljubljana) report: Observations of GRB 130606A (Ukwatta et al., GCN 14781) with the 2-m robotic Liverpool Telescope automatically performed between 48 and 80 minutes after the GRB trigger confirms a detection of the afterglow in the r'-band with magnitude r' = 21.9 ± 0.29 at 49.95 minutes consistent with reported values at similar epochs (Xu et al. 14783) and dimmer than times around 100 minutes post trigger (Leonini et al., GCN 14791; Masi et al., GCN 14789; Sonbas et al., GCN 14797), possibly indicating mild re-brightening. This detection clarifies that the afterglow has not yet dropped out of the r'-band at the times coincident with our i' and z' band detections (Virgili et al., GCN 14785) and continues to be detected until at least 6.4 hrs after the initial trigger (Afonso et al., GCN 14807). In addition, the 2-m Faulkes Telescope North and Liverpool Telescope performed late-time follow up observations, resulting in a 3-sigma upper-limit of r' > 23.4 at 849.73 min (14.16 hr post-trigger; FTN) r' > 24 at 1683.67 minutes (= 28.06 hr; LT) and an additional i'-band detection of i' = 23.76 ± 0.22 @ 28.60 hr (= 1716.51 minutes; LT), in a co-added series of 6x300s exposures, which are consistent with values reported by Trotter et al. (GCN 14815) and Butler et al. (GCN 14824). FTN images have been acquired with the R-Bessell filter and calibrated against nearby SDSS catalogue stars.