TITLE: GCN CIRCULAR NUMBER: 19255 SUBJECT: GRB 160401A: Zadko observatory - Gingin optical observations DATE: 16/04/02 14:19:27 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 160401A detected by Integral (Mereghetti et al. GCNC 19251) with the Zadko robotic telescope (D=100cm) located at the observatory - Gingin, Australia. The observations started 0.63 day after the GRB trigger as soon as the night became. The elevation of the field decreased from 27 degrees above horizon and weather conditions were good. We co-added a series of exposures. We did not observed any new optical source than those in the SDSS in a radius of 2 arcmin centered ont the position RA=05:58:57 Dec=+26:40:33 J2000.0: t1(d) t2(d) Rmag_lim 0.63 0.66 19.0 Magnitudes were estimated with the nearby USNO-B1 stars and are not corrected for galactic dust extinction. N.B. Galactic coordinates are lon=183.4 lat= +1.4