TITLE: GCN CIRCULAR NUMBER: 8446 SUBJECT: GRB081029: Swift XRT refined analysis DATE: 08/10/29 11:10:09 GMT FROM: Jirong Mao at INAF-OAB J. Mao, R. Margutti, C. Guidorzi (INAF-OAB) and T. Sakamoto (NASA/ UMBC) report on behalf of the Swift-XRT team: We have analysed the first 3 orbits of Swift-XRT data obtained for GRB 081029 (Sakamoto et al., GCN Circ. 8435). From T+2.7 to T+16.7 ks after the burst, data were collected in Photon Counting (PC) mode with a total net exposure of 7 ks. The UVOT-enhanced position was given by Goad et al. in GCN Circ. 8443. The light curve shows a decay that can be fit with a simple power law with an index of 0.57 +- 0.05. The PC spectrum accumulated between T+2.7 and T+16.7 ks can be fit with a absorbed power-law model with a photon index of 1.9 +- 0.1 and an absorbing equivalent hydrogen column density consistent with the Galactic one in the GRB direction (2.7e20 cm^-2; Kalberla et al. 2005). The observed (unabsorbed) 0.3-10 keV flux is 6.9(7.5)e-12 erg cm^-2 s^-1. If the light-curve continues to decay with alpha ~ 0.57, the count rate 24 hours after the burst is estimated to be 0.03 count s^-1, which corresponds to an observed flux of 2.1e-12 erg cm^-2 s^-1. This is an official product of the Swift-XRT team. [GCN OPS NOTE(29oct08): Per author's request, the GRB name in the subject was changed from 080229 to 081029.]