GRB 160521B: Theoretical estimate of the redshift and urgent need for further x-ray observations. Ruffini, R. ; Aimuratov, Y. ; Becerra, L. ; Bianco, C. L. ; Kovacevic, M. ; Moradi, R. ; Muccino, M. ; Penacchioni, A. V. ; Pisani, G. B. ; Primorac, D. ; Rueda, J. ; Wang, Y. Abstract Publication: GRB Coordinates Network Pub Date: 2016 Bibcode: 2016GCN.19456....1R