TITLE: GCN CIRCULAR NUMBER: 10181 SUBJECT: GRB 091117: Swift-XRT observations DATE: 09/11/19 23:47:45 GMT FROM: Matteo Perri at ISAC/ASDC V. D'Elia, M. Perri (ASDC), J. Cummings (GSFC/CRESST) report on behalf of the Swift-XRT team: We have analysed further 4.0 ks of XRT data for GRB 091117 (Cummings et al. GCN Circ. 10171), from 161.3 ks to 172.4 ks after the trigger. The data are entirely in Photon Counting (PC) mode. We found that Source #1 (Berger, GCN Circ. 10173; D'Elia et al., GCN Circ. 10177; Fox, GCN Circ. 10179) is detected with a count rate of (1.9+/-0.9)e-3 cts/s, thus showing some evidence of fading with respect to the first Swift follow-up observation (errors are given at the 1-sigma level). We note that the photon statistics is low and further observations are needed to firmly assess that this source is the X-ray afterglow of the burst. Source #2 (D'Elia et al., GCN Circ. 10177; Fox, GCN Circ. 10179) is instead not detected. The derived 3-sigma upper limit value on its count rate, ~3.3e-3 cts/s, does not allow to constrain the temporal behavior of this source. This circular is an official product of the Swift-XRT team.