TITLE: GCN CIRCULAR NUMBER: 8405 SUBJECT: GRB 081024: Swift-XRT refined analysis DATE: 08/10/24 20:31:08 GMT FROM: Matteo Perri at ISAC/ASDC G. Stratta (ASDC) reports on behalf of the Swift-XRT team: We have analysed the first orbit of the XRT data obtained for GRB 081024 (Stratta et al., GCN Circ. 8398). From T+78 s to T+105 s after the burst, data were collected in Windowed Timing mode and then XRT switched to Photon Counting mode. The Enhanced Swift-XRT position was given by Beardmore et al. in GCN Circ. 8403. The 0.3-10 keV flux from T+78 s to T+355 s shows a very steep decay with a possible small re-brightening between ~T+145 s to ~T+205 s. Excluding the re-brightening and assuming a power law decay, the best fit decay index is alpha = 3.7 (+0.8,-0.5). The spectrum of the WT data, with an integration time of 27s, can be modelled with a power-law model with photon index of 1.6 (+0.6,- 0.3). The total absorbing equivalent hydrogen column density is consistent with the Galactic one NH = 7.71E+21 cm^-2 (Kalberla et al. 2005). The observed (unabsorbed) 0.3-10 keV flux is 4.1(6.1)E-10 erg/cm^-2 s^-1 No source counts are detected after the first orbit, likely due to the very steep flux decay. This is an official product of the Swift-XRT team.