TITLE: GCN CIRCULAR NUMBER: 16017 SUBJECT: GRB 140320C: Swift-XRT observations DATE: 14/03/21 10:34:38 GMT FROM: Claudio Pagani at U of Leicester C. Pagani, K.L. Page and P.A. Evans report on behalf of the Swift-XRT team: We have analysed 4.0 ks of XRT data for the INTEGRAL-detected burst: GRB 140320C, from 19.5 ks to 37.3 ks after the INTEGRAL trigger. The data are entirely in Photon Counting (PC) mode. An X-ray source is detected within the INTEGRAL error circle. Using 1552 s of PC mode data and 1 UVOT images, we find an enhanced XRT position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 134.39421, +71.19839 which is equivalent to: RA (J2000): 08h 57m 34.61s Dec(J2000): +71d 11' 54.2" with an uncertainty of 2.6 arcsec (radius, 90% confidence). This position is 27 arcsec from the INTEGRAL position. The light curve can be modelled with a power-law decay with a decay index of alpha=2.8 (+1.0, -1.7). A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.3 (+0.9, -0.3) and an absorption column consistent with the Galactic value of 3.6 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 5 x 10^-11 (5 x 10^-11) erg cm^-2 count^-1. If the light curve continues to decay with a power-law decay index of 2.8, the count rate at T+24 hours will be 2.4 x 10^-4 count s^-1 The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00020371. This circular is an official product of the Swift-XRT team.