GCN Circular 9238
C. Guidorzi (U. Ferrara), D. Bersier (Liverpool JMU), and N. Tanvir (U. Leicester) on behalf of a larger collaboration report: We began observing the field of GRB 090424 (Cannizzo et al. GCN Circ. 9223) with the 2-m Liverpool Telescope at 21:29:47 UT. We clearly detect the optical afterglow (Cannizzo et al. GCN Circ 9223; Yuan et al. GCN Circ. 9224; Xin et al. GCN Circ. 9225; Schady et al. GCN Circ. 9234; Gorosabel et al. GCN Circ. 9236) with r'=19.93 � 0.03 at a mid epoch of 7.55 hrs post burst from a 6x300 s coadded exposure. Calibration was performed with respect to nearby SDSS field stars.