GRB 121211A: Swift-XRT refined analysis. Burrows, D. N. ; Pagani, C. ; Beardmore, A. P. ; Evans, P. A. ; Maselli, A. ; Melandri, A. ; Kennea, J. A. ; Stroh, M. C. ; Mangano, V. Abstract Publication: GRB Coordinates Network Pub Date: 2012 Bibcode: 2012GCN.14061....1B