TITLE: GCN CIRCULAR NUMBER: 12952 SUBJECT: GRB 120213A: Swift-XRT refined Analysis DATE: 12/02/13 12:40:03 GMT FROM: Phil Evans at U of Leicester J.A. Kennea (PSU), M.C. Stroh (PSU), D.N. Burrows (PSU), A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester), O.M. Littlejohns (U. Leicester), A. Melandri (INAF-OAB), B. Sbarufatti (INAF-OAB/PSU), G. Stratta (ASDC) and T. Sakamoto report on behalf of the Swift-XRT team: We have analysed 6.5 ks of XRT data for GRB 120213A (Sakamoto et al. GCN Circ. 12942), from 53 s to 22.8 ks after the BAT trigger. The data comprise 886 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Beardmore et al. (GCN. Circ 12944). The late-time light curve (from T0+5.3 ks) can be modelled with a power-law decay with a decay index of alpha=3.02 (+0.19, -0.18). A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 3.28 (+/-0.07). The best-fitting absorption column is 3.52 (+0.15, -0.14) x 10^21 cm^-2, in excess of the Galactic value of 1.0 x 10^21 cm^-2 (Kalberla et al. 2005). The PC mode spectrum has a photon index of 2.22 (+/-0.15) and a best-fitting absorption column of 1.7 (+/-0.4) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.4 x 10^-11 (5.4 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 1.7 (+/-0.4) x 10^21 cm^-2 Galactic foreground: 1.0 x 10^21 cm^-2 Excess significance: 3.2 sigma Photon index: 2.22 (+/-0.15) The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00514767. This circular is an official product of the Swift-XRT team.