GRB 221009A: Continued Swift/XRT observations

Swift XRT has continued to observe GRB 221009A from 159s to 100 ks after the BAT trigger. The WT-mode spectrum for the afterglow was given in GCN 32651. The lightcurve can be best modelled as a four-component power law decay with: Alpha_1 : 2.6 (+0.4, -0.7) Tbreak_1: 177.4 (+2.0, -9.6) Alpha_2 : 0.144 (+0.022, -0.026) Tbreak_2: 610 (+84, -78) Alpha_3 : 0.31 (+0.04, -0.03) Tbreak_3: (4.06 [+0.23, -0.19]) × 10^3 Alpha_4 : 1.357 (+/-0.010) With T0 the BAT trigger time. The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/01126853. This circular is an official product of the Swift-XRT team.