TITLE: GCN CIRCULAR NUMBER: 13327 SUBJECT: GRB 120521A: XRT light curve (Correction to GCN 13326) DATE: 12/05/22 07:22:33 GMT FROM: Phil Evans at U of Leicester P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team: There was an error in GCN 13326: the light curve decay slope was reported as infinity. The XRT light curve in fact shows a plateau (alpha=0.2 +/-0.4) until T0+270 seconds. After this it undergoes an extremely sharp decay (alpha~10) and is not detected in X-rays after T0+1ks.