TITLE: GCN CIRCULAR NUMBER: 16723 SUBJECT: Fermi 430148973/MASTER candidate: LCO-Sutherland observations DATE: 14/08/19 22:23:05 GMT FROM: Simone Dichiara at Ferrara U/Italy S. Dichiara, C. Guidorzi (U. Ferrara), D. Kopac (U. Ljubljana) on behalf of a large collaboration report: We observed the MASTER OT candidate (Lipunov et al. GCN Circ 16720; Espartero et al. GCN Circ. 16722) with one of the Las Cumbres Observatory 1-m telescopes in Sutherland (South Africa) on August 19 at 17:43:02 UT, i.e. ~3.9 hours after the trigger time (GCN Circ. 16720) with the r',i',z', and Y filters. At the position of the MASTER OT candidate we found nothing down to the following limits: Mid time from Total Exp Filter Magnitude trigger (hr) (s) ------------------------------------------------- 4.51 1080 r' > 20.4 4.57 960 i' > 19.6 ------------------------------------------------- calibrated against nearby USNOB1 stars.