TITLE: GCN CIRCULAR NUMBER: 9574 SUBJECT: GRB 090625B: Faulkes Telescope South observations DATE: 09/06/25 17:20:34 GMT FROM: Cristiano Guidorzi at Ferrara U,Italy C. Guidorzi (U. Ferrara), D. Bersier (Liverpool JMU), P. O'Brien, N. Tanvir (U. Leicester) on behalf of a large collaboration report: On 2009 June 25 at 13:28:21 UT the 2-m Faulkes Telescope South automatically began observing the INTEGRAL GRB 090625B (Gotz et al., GCN Circ. 9572). Observations started 120 seconds after the IBAS trigger time and were performed using the B, V, R and i' filters. We could not find any uncatalogued object inside the XRT error circle (Mao et al., GCN Circ. 9573) down to the following limiting magnitudes: For single frames: Mid Time Exposure Filter Limit (s) (s) (mag) ------------------------------------- 141 3x10 R > 19.3 526 10 i' > 18.5 ------------------------------------- For coadded frames: Time Range Exposure Filter Limit (min) (s) (mag) ------------------------------------- 22.5-45.2 420 R > 21.0 25.4-48.2 420 i' > 20.3 ------------------------------------- Calibration was performed using a few USNOB1 nearby stars, adopting R2 and I values.