TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2996 SUBJECT: GRB050126: Updated Swift XRT Position DATE: 05/01/28 19:34:04 GMT FROM: Gianpiero Tagliaferri at OAB-INAF S. Campana, G. Chincarini, A. Moretti, C. Pagani, P. Romano, G. Tagliaferri (OAB), D. N. Burrows, J. E. Hill, J. A. Kennea, D. Morris, J. A. Nousek (PSU), M. Capalbi, P. Giommi, M. Perri, (ASDC/ASI), G. Cusumano, V. Mangano (IASF/Pa), J. Osborne, K. Page, M. Goad, A. Beardmore, A. Wells (U. Leicester), N. Gehrels, N. White, L. Angelini, F. Marshall (NASA/GSFC), K. McGowan, K. Mason (MSSL) report on behalf of the Swift XRT team: We have obtained a new XRT position, using the ground-based pipeline processing software, including stellar aberration correction. The analysis is based on 4 different orbits and the source is detected each time. Although in the last orbits we have only few counts the derived coordinates are very consistent and differ by less than 5 arcseconds. The new position for the X-ray afterglow is: RA(J2000) = 18:32:27.0, Dec(J2000) = +42 22 13.5 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.