GRB 180914B: Optical counterpart observation from OAJ. de Ugarte Postigo, A. ; Izzo, L. ; Kann, D. A. ; Thoene, C. C. ; Ramio, H. V. ; Maicas, N. ; Tilve, V. Abstract Publication: GRB Coordinates Network Pub Date: 2018 Bibcode: 2018GCN.23239....1D