TITLE: GCN CIRCULAR NUMBER: 7900 SUBJECT: GRB 080623: Swift-XRT refined analysis DATE: 08/06/23 20:06:49 GMT FROM: Dolores Perez-Ramirez at U.Leicester D. Perez (U. Leicester-U. Jaen), K.L. Page (U. Leicester), T. N. Ukwatta (GSFC/GWU), report on behalf of the Swift-XRT team: We have analysed the first three orbits of data obtained for GRB 080623 (Ukwatta et al., GCN Circ. 7894), covering 4.3ks of Photon Counting (PC) mode data. The UVOT-enhanced XRT position was given by Beardmore et al. in GCN Circ. 7898. The light-curve can be fitted with a single powerlaw with a decay of alpha ~1.0 +/- 0.1. The first three orbits of PC data can be modelled with an absorbed powerlaw, with Gamma = 2.03 +/- 0.14 and total NH = (0.37 +/- 0.05)x10^22 cm^-2, in excess of the Galactic value of 0.26x10^22 cm^-2. The observed (unabsorbed) flux over this time interval is 8.05 x10^-12 (1.34x10^-11) erg cm^-2 s^-1. The counts to observed flux conversion is 5.3x10^-11 erg cm^-2 count^-1. If the light-curve continues to decay at alpha ~ 1.0, the count rate at 24 hours is predicted to be 0.0086 count s^-1, corresponding to an observed flux of 4.5x10^-13 erg cm^-2 s^-1. This is an official product of the Swift-XRT team.