GRB 181228A: FRAM-ORM optical limit. Jelinek, M. ; Strobl, J. ; Masek, M. ; Janecek, P. ; Karpov, S. ; Jurysek, J. ; Ebr, J. ; Cunniffe, R. ; Travnicek, P. ; Prouza, M. Abstract Publication: GRB Coordinates Network Pub Date: 2019 Bibcode: 2019GCN.23669....1J