TITLE: GCN CIRCULAR NUMBER: 15603 SUBJECT: GRB 131218A: Zadko observatory - Gingin optical candidate DATE: 13/12/19 21:45:22 GMT FROM: Alain Klotz at IRAP-CNRS-OMP A. Klotz (IRAP-CNRS-OMP), D. Macpherson (UWA/ICRAR), D. Coward (UWA), B. Gendre, M. Boer, K. Siellez, H. Dereli , O. Bardho (UNS-CNRS-OCA), A. Williams (PO-UWA), R. Martin (PO-UWA), D. Turpin (IRAP-CNRS-OMP) report: We imaged the field of GRB 131218A detected by INTEGRAL (trigger 6409) with the Zadko robotic telescope (D=100cm) located at the observatory - Gingin, Australia. The observations are R filtered, started 0.87 day after the GRB trigger. The limiting magnitude of the co added image is Rlim = 20.5. In the error box provided by INTEGRAL notice we detect only one faint candidate not present on the DSS atlas: RA(J2000.0) = 07h 35m 10.50s DEC(J2000.0) = -64d 43' 19.4" OT was R~20.0 0.87 day after GRB. We have no more images so we cannnot conclude if it is a fading source or not. Additional images are programmed to be recorded in the next nights.