TITLE: GCN CIRCULAR NUMBER: 19647 SUBJECT: GRB 160703A: Zadko observatory - Gingin optical observations DATE: 16/07/03 19:25:36 GMT FROM: Alain Klotz at IRAP-CNRS-OMP Klotz A., Turpin D., Atteia J.L. (CNRS-OMP-IRAP), Boer, M., Laugier, R. (CNRS-ARTEMIS), Gendre B. (UVI - Etelman Obs.), Coward, D. McPherson, D. Williams A., Martin R., Moore J., Dodson R. (UWA) report: We imaged the field of GRB 160703A detected by SWIFT (trigger 702699) with the Zadko robotic telescope (D=100cm) located at the observatory - Gingin, Australia. The observations started 5.5h after the GRB trigger. The elevation of the field decreased from only 20 degrees above horizon and weather conditions were good. We co-added a series of exposures. No credible source was found in the BAT error box: t0+5.5h to t0+5.6h : Rlim = 19.4 Magnitudes were estimated with the nearby USNO-B1 stars and are not corrected for galactic dust extinction.