TITLE: GCN CIRCULAR NUMBER: 7126 SUBJECT: GRB 071122 Swift-XRT refined analysis DATE: 07/11/22 10:23:32 GMT FROM: Phil Evans at U of Leicester P.A. Evans, K.L. Page, R.L.C. Starling (U. Leicester) and M. Stamatikos (NASA/ORAU) report on behalf of the Swift-XRT team: We have analysed 1.4 ks of Swift XRT data for GRB 071122 (Stamatikos et al. GCN Circ 7121), comprising 125 s in Windowed Timing (WT) mode and 1.3 ks in Photon Counting (PC) mode. The observations started 146 s after the BAT trigger. Using 778 s of overlapping XRT Photon Counting mode and UVOT V-band data, we find an astrometrically corrected X-ray position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 276.60547, 47.07504 which is equivalent to: RA (J2000): 18 26 25.31 Dec (J2000): +47 04 30.1 with an uncertainty of 1.7 arcsec (radius, 90% confidence). This position is 1.5 arcsec from the optical afterglow reported by Cenko (GCN Circ 7125), 74 arcsec from the initial BAT position, within the BAT error circle, and 7.1 arcsec from the initial XRT position. The XRT light curve follows a power-law decay with alpha=2.52 (+0.10/-0.09). There is also a small flare at approximately T0+400 s. The WT mode spectrum can be fitted with an absorbed power-law, with the absorption column fixed at the Galactic value of 4.75e20 cm^-2. Adding a redshifted absorber at z=1.14 (Cucchiara et al. GCN Circ 7124) improved the fit marginally, with chi-squared decreasing from 36.14 for 39 degrees of freedom, to 32.83 for 38 degrees of freedom. An f-test indicates that the probability of this being a chance improvement is ~5%. The redshifted absorber has a column density of 9.9e20 (+10.0e20/-9.0e20) cm^-2, and a power-law index, gamma of 2.00 (+0.14/-0.13). The observed (unabsorbed) 0.3-10 keV flux is 2.52e-10 (3.04e-10) erg cm^-2 s^-1. The predicted count-rate at T+24 hours is 1.69e-6 s^-1, which corresponds to an observed (unabsorbed) 0.3-10 keV flux of 6.11e-17 (7.37e-17) erg cm^-2 s^-1. Due to the proximity of this GRB to the sun, no further observations are planned. This circular is an official product of the Swift-XRT team.