GCN Circular 3889
V. Mangano (INAF-IASF), D. Morris (PSU), D. Burrows (PSU), J. Kennea (PSU), L. Angelini (GSFC-JHU), N. White (GSFC) report on behalf of the Swift XRT team: We have analyzed the Swift XRT data from the first observation of GRB 050826 (four orbits). The new refined coordinates are: RA(J2000) = 05h 51m 01.3s Dec(J2000) = -02:38:41.9 with an uncertainty of 6 arcseconds radius (90% containment). This position is 2.6 arcmin from the BAT position given in GCN 3384 (Mangano et al 2005a) and consistent with the previously distributed coodinates given in GCN 3385 (Mangano et al 2005b). The 0.2-10 keV light curve in Photon Counting (PC) mode starts 114.97 seconds from the BAT trigger. The light curve shows a single power law decay with slope -1.16 +/- 0.07 (90% confidence level). A preliminary spectral fit to the first orbit PC data gives a spectral power law photon index of 2.0 +/- 0.4 in the [0.2-10] keV band, with an absorption column of 8e21 cm^2, in excess of the Galactic value (2e21 cm^2). The average (in the time range 100-700 seconds from trigger) estimated unabsorbed 0.5-10 keV flux is then 6.9E-11 erg cm-2 s-1. The predicted flux at T=24 h after the trigger is at the level of 7.0e-14 erg cm-2 s-1 (or 1.0e-3 counts/s).