GRB 120521B: Swift detection of a burst. Cummings, J. R. ; Barthelmy, S. D. ; Chester, M. M. ; D'Elia, V. ; Gehrels, N. ; Gendre, B. ; Palmer, D. M. ; Sonbas, E. ; Stratta, G. Abstract Publication: GRB Coordinates Network Pub Date: 2012 Bibcode: 2012GCN.13305....1C