TITLE: GCN CIRCULAR NUMBER: 15739 SUBJECT: GRB 140114A: Swift-XRT refined Analysis DATE: 14/01/15 00:23:05 GMT FROM: Phil Evans at U of Leicester V. Mangano (PSU), M.C. Stroh (PSU), P.A. Evans (U. Leicester), B.P. Gompertz (U. Leicester), J.P. Osborne (U. Leicester), B. Sbarufatti (INAF-OAB/PSU), P. D'Avanzo (INAF-OAB), V. D'Elia (ASDC), D.N. Burrows (PSU) and E. Troja report on behalf of the Swift-XRT team: We have analysed 11 ks of XRT data for GRB 140114A (Troja et al. GCN Circ. 15728), from 118 s to 24.7 ks after the BAT trigger. The data comprise 449 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 15733). The late-time light curve (from T0+5.0 ks) can be modelled with a power-law decay with a decay index of alpha=0.50 (+/-0.15). A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 2.22 (+/-0.03). The best-fitting absorption column is 1.53 (+/-0.07) x 10^21 cm^-2, in excess of the Galactic value of 1.6 x 10^20 cm^-2 (Kalberla et al. 2005). The PC mode spectrum has a photon index of 2.33 (+0.21, -0.20) and a best-fitting absorption column of 1.3 (+0.5, -0.4) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.1 x 10^-11 (4.8 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 1.3 (+0.5, -0.4) x 10^21 cm^-2 Galactic foreground: 1.6 x 10^20 cm^-2 Excess significance: 4.5 sigma Photon index: 2.33 (+0.21, -0.20) If the light curve continues to decay with a power-law decay index of 0.50, the count rate at T+24 hours will be 0.020 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 6.2 x 10^-13 (9.6 x 10^-13) erg cm^-2 s^-1. The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00583861. This circular is an official product of the Swift-XRT team.