TITLE: GCN CIRCULAR NUMBER: 16474 SUBJECT: GRB 140628A: Zadko observatory - Gingin optical observations DATE: 14/06/29 01:25:11 GMT FROM: Alain Klotz at IRAP-CNRS-OMP A. Klotz, D. Turpin (IRAP-CNRS-OMP), D. Macpherson (UWA/ICRAR), D. Coward (UWA), M. Boer, B. Gendre, K. Siellez, H. Dereli, O. Bardho (UNS-CNRS-OCA), A. Williams (PO-UWA), R. Martin (PO-UWA) report: We imaged the field of GRB 140628A detected by SWIFT (trigger 602803) with the Zadko robotic telescope (D=100cm) located at the observatory - Gingin, Australia. The observations started 6.72h after the GRB trigger. The elevation of the field increased from 22 degrees above horizon and weather conditions were poor. We co-added a series of exposures. We do not see any optical counterpart at the UVOT position mentioned by Kuin et al. (GCNC 16472): t0+6.72h to t0+7.27h : Rlim = 19.9 Magnitudes were estimated with the nearby USNO-B1 stars and are not corrected for galactic dust extinction.