Swift trigger 556533 is probably not an astrophysical event. Beardmore, A. P. ; Krimm, H. A. ; Mountford, C. J. ; Page, K. L. ; Palmer, D. M. ; Siegel, M. H. Abstract Publication: GRB Coordinates Network Pub Date: 2013 Bibcode: 2013GCN.14699....1B