GRB 190627A: Optical imaging and spectroscopy from Calar Alto. Kann, D. A. ; de Ugarte Postigo, A. ; Izzo, L. ; Blazek, M. ; Thoene, C. C. ; Guijarro, A. ; Pedraz, S. Abstract Publication: GRB Coordinates Network Pub Date: 2019 Bibcode: 2019GCN.24901....1K