TITLE: GCN CIRCULAR NUMBER: 29371 SUBJECT: GRB 140320B: Swift-XRT refined Analysis DATE: 21/01/29 14:52:13 GMT FROM: Phil Evans at U of Leicester V. D'Elia (SSDC & INAF-OAR), A. D'Ai (INAF-IASFPA), J.A. Kennea (PSU), A. Tohuvavohu (U. Toronto), B. Sbarufatti (PSU), A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester), J.P. Osborne (U. Leicester), A. Melandri (INAF-OAB) and C. Pagani report on behalf of the Swift-XRT team: report on behalf of the Swift-XRT team: We have analysed 6.0 ks of XRT data for the INTEGRAL-detected burst GRB 140320B (Pagani et al. GCN Circ. 16013), from 12.0 ks to 29.4 ks after the INTEGRAL trigger. The data are entirely in Photon Counting (PC) mode. The refined XRT position is RA, Dec = 145.5611, +60.2690 which is equivalent to: RA (J2000): 09 42 14.66 Dec(J2000): +60 16 08.3 with an uncertainty of 3.6 arcsec (radius, 90% confidence). This position is 51 arcsec from the INTEGRAL position. We cannot determine at the present time whether the source is fading. A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.4 (+0.4, -0.3). The best-fitting absorption column is 7.2 (+7.1, -4.8) x 10^20 cm^-2, consistent with the Galactic value of 2.4 x 10^20 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 2.8 x 10^-11 (3.8 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 7.2 (+7.1, -4.8) x 10^20 cm^-2 Galactic foreground: 2.4 x 10^20 cm^-2 Excess significance: <1.6 sigma Photon index: 2.4 (+0.4, -0.3) The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00020370. This circular is an official product of the Swift-XRT team.