GRB 130427A: NOT optical photometry and redshift. Xu, D. ; de Ugarte Postigo, A. ; Schulze, S. ; Jessen-Hansen, J. ; Leloudas, G. ; Kruehler, T. ; Fynbo, J. P. U. ; Jakobsson, P. Abstract Publication: GRB Coordinates Network Pub Date: 2013 Bibcode: 2013GCN.14478....1X