TITLE: GCN CIRCULAR NUMBER: 19282 SUBJECT: GRB 160410A: Swift-XRT refined Analysis DATE: 16/04/11 05:36:03 GMT FROM: Phil Evans at U of Leicester B. Sbarufatti (INAF-OAB/PSU), K.L. Page (U. Leicester), C. Pagani (U. Leicester), A.P. Beardmore (U. Leicester), A. Maselli (INAF-IASFPA), A. Melandri (INAF-OAB), P. D'Avanzo (INAF-OAB), D.N. Burrows (PSU), T.G.R. Roegiers (PSU) and S.L. Gibson report on behalf of the Swift-XRT team: We have analysed 5.7 ks of XRT data for GRB 160410A (Gibson et al. GCN Circ. 19271), from 72 s to 67.9 ks after the BAT trigger. The data comprise 241 s in Windowed Timing (WT) mode (the first 9 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Beardmore et al. (GCN Circ. 19273). The light curve can be modelled with a power-law decay with a decay index of alpha=1.54 (+/-0.11). A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.28 (+0.12, -0.06). The best-fitting absorption column is consistent with the Galactic value of 1.8 x 10^20 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 1.9 (+0.8, -0.5) and a best-fitting absorption column of 2 (+34, -2) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.5 x 10^-11 (3.8 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Galactic foreground: 1.8 x 10^20 cm^-2 Intrinsic column: 2 (+34, -2) x 10^21 cm^-2 at z=1.717 Photon index: 1.9 (+0.8, -0.5) The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00682269. This circular is an official product of the Swift-XRT team.