TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2975 SUBJECT: GRB050124: Updated Swift XRT Position and Fluxes DATE: 05/01/24 23:18:00 GMT FROM: David Burrows at PSU/Swift J. P. Osborne, K. Page, M. Goad (UL), A. Beardmore, A. F. Abbey, A. A. Wells (U. Leicester), S. Campana, A. Moretti, C. Pagani, P. Romano, G. Tagliaferri, G. Chincarini (OAB), L. Angelini, F. Marshall, N. Gehrels (NASA/GSFC), J. E. Hill, J. Kennea, D. N. Burrows, J. A. Nousek, P. Roming, P. Meszaros (PSU), G. Cusumano, V. Mangano (IFSFC), P. Schady (MSSL), and S. Piranomonte (ASDC) report on behalf of the Swift XRT team: We have obtained a refined XRT position, using the ground-based pipeline processing software, including stellar aberration correction. The refined position for the X-ray afterglow is: RA(J2000) = 12:51:30.4, Dec(J2000) = +13:02:39.0. We estimate a remaining uncertainty of about 8 arcseconds, including a systematic error of about 5 arcseconds due to residual alignment offsets that have not been fully calibrated yet. We now have data from 3 orbits. Data were collected between 14:35:15 and 15:17:12 UT, between 16:11:35 and 16:53:41 UT, and between 17:48:02 and 18:30:03. The point source is clearly fading, with average observed count rates 0.20 cps, 0.14 cps, and 0.09 cps in the three observations. A preliminary spectral fit to data from the first orbit gives a spectral power law photon index of 1.3 +/- 0.1, assuming Galactic absorption (2E20 cm^-2). The average estimated unabsorbed 1-5 keV flux is then about 6E-12 erg cm^-2 s^-1 at about 3.5 hours post-burst.