GRB 120521A: Swift-XRT refined analysis. Kennea, J. A. ; Stroh, M. C. ; Burrows, D. N. ; Beardmore, A. P. ; Evans, P. A. ; Littlejohns, O. M. ; D'Elia, V. ; Maselli, A. ; Mangano, V. Abstract Publication: GRB Coordinates Network Pub Date: 2012 Bibcode: 2012GCN.13326....1K