TITLE: GCN CIRCULAR NUMBER: 6315 SUBJECT: GRB 070419A: Faulkes Telescope North Optical Observations DATE: 07/04/19 15:38:29 GMT FROM: James Smith at ARI,Liverpool John Moors U R.J. Smith, C.G. Mundell, S.N. Fraser, I.A. Steele, C.J. Mottram, A. Melandri, D.F. Bersier, M.F. Bode (Liverpool JMU), C. Guidorzi (Uni-Bicocca/INAF-OAB), A. Gomboc (Ljubljana), P. O'Brien, E. Rol, N. Bannister (U. Leicester) report on behalf of the RoboNet GRB collaboration The 2-m Faulkes North Telescope (Hawaii) reacted to the Swift burst GRB070419A (Stamatikos et al. GCN 6302). Observations were delayed by scheduled engineering work and only started about 37 min after the trigger time. BRi observations continued until 104min after the trigger. We detect the optical transient reported by Chornock et al (GCN 6304) in R and i' band filters and measure a power law decay index of ~ 1.5 throughout the hour of observation. UTC minutes_since_trigger Mag 10:49:46.5 50.36 g' > 19.8 (limit only) 10:51:20.8 51.91 r' = 20.37 10:53:07.9 53.70 i' = 20.22 Magnitudes are based on comparison with SDSS magnitudes of the adjacent star SDSS J121057.55+395539.9. The target has set and further observations are not currently ongoing with this telescope.