TITLE: GCN CIRCULAR NUMBER: 11474 SUBJECT: GRB 101219A: Swift-XRT refined Analysis DATE: 10/12/19 21:10:08 GMT FROM: Jonathan Gelbord at PSU/Swift J.M. Gelbord (PSU) and D. Grupe (PSU) report on behalf of the Swift-XRT team: We have analysed 5.8 ks of XRT data for GRB 101219A (Gelbord et al. GCN Circ. 11461), from 70 s to 18.0 ks after the BAT trigger. The data comprise 13 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The light curve after 200s can be modelled as a power-law decay. The decay index is alpha=-1.8 (+/-0.2). A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.78 (+0.25, -0.23). The best-fitting absorption column is 3.1 (+1.1, -0.9) x 10^21 cm^-2, in excess of the Galactic value of 4.87 x 10^20 cm^-2 (Kalberla et al. 2005). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.9 x 10^-11 (6.9 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 3.1 (+1.1, -0.9) x 10^21 cm^-2 Galactic foreground: 4.9 x 10^20 cm^-2 Excess significance: 4.8 sigma Photon index: 1.78 (+0.25, -0.23) If the light curve continues to decay with a power-law decay index of 1.8, the count rate at T+24 hours will be 2 x 10^-5 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 7.5 x 10^-16 (1.1 x 10^-15) erg cm^-2 s^-1. The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00440606. This circular is an official product of the Swift-XRT team.