TITLE: GCN CIRCULAR NUMBER: 8009 SUBJECT: GRB 080723B - Swift-XRT refined analysis DATE: 08/07/24 07:01:14 GMT FROM: Kim Page at U.of Leicester K.L. Page (U. Leicester) reports on behalf of the Swift-XRT team: The INTEGRAL/Super-AGILE-detected GRB 080723B has now been observed by the Swift-XRT for three orbits (a total of ~2.3 ks of Photon Counting mode data). The source reported in GCN Circ. 8008 can now be seen to be fading (alpha = 1.27 +/- 0.23), so is confirmed as the X-ray afterglow. A spectrum formed from the combined data (~1.3 - 30 ks after the triggers) can be fitted by a power-law of Gamma = 1.87 +/- 0.14, absorbed by the Galactic column in this direction, of 7.42x10^21 cm^-2. The average observed (unabsorbed) flux over this time is 1.49 (2.57) x 10^-9 erg cm^-2 s^-1, which provides an observed counts to flux conversion of 5.9x10^-9 erg cm^-2 count^-1. If the decay were to continue with alpha ~1.27, the count rate 24 hours after the trigger woule be 0.04 count s^-1 (corresponding to an observed flux of 2.4x10^-10 erg cm^-2 s^-1). The circular is an official product of the Swift-XRT team.