TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4764 SUBJECT: GRB060206: Swift XRT observations of an unbroken powerlaw decay DATE: 06/02/15 23:34:08 GMT FROM: David Morris at PSU/Swift-XRT D. C. Morris (PSU), C. Pagani (PSU), D. N. Burrows (PSU), J. A. Kennea (PSU) and K.Page (U. Leicester) report on behalf of the Swift XRT team: The Swift XRT has continued to monitor the light curve of GRB060206 with data taken as late as T+8 days. Our complete X-ray dataset from T+5ks to T+700ks remains consistent with a single unbroken powerlaw decay with alpha=1.35+/-0.15. We note that there is apparent variability, both positive and negative, on the timescale of days in the X-ray lightcurve somewhat larger than is implied by simple counting statistics. Our data are not consistent, however, with a break to a slope of -2.2 at T+27 hours and thus we cannot confirm the presence of the jet break reported in I-band observations by LaCluyze et al. (GCN 4750). The XRT data remain consistent with the prediction by Palmer et al (GCN 4597) of a jet break at 8.6 or 10.4 days (743ks or 899ks). The XRT countrate during the last observation, on February 14th, was 2e-3 cts/s, equivalent to a flux of approximately 1.5e-13 ergs/cm2/s. Observations are ongoing. The XRT lightcurve can be viewed at http://www.swift.psu.edu/images/GRB060206.jpg This circular is an official product of the Swift XRT Team.