TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4733 SUBJECT: GRB060210: Swift XRT Refined Analysis DATE: 06/02/10 13:36:53 GMT FROM: Andy Beardmore at U Leicester A.P. Beardmore, S. Mateos, K.L. Page (UL), D.N. Burrows (PSU) report on behalf of the Swift XRT Team. We have analysed the Swift XRT data from the first 3 orbits of GRB 060210 (Beardmore et al, GCN 4724). The refined XRT position from 2.5 ks of photon counting mode data is RA(J2000) = 3h 50m 57.4s Dec(J2000) = +27d 01' 36.4" with an estimated uncertainty of 3.6 arcsec (90% containment). This position is 29.5 arcseconds from the BAT position given in GCN 4724 and 2.0 arcseconds from the optical afterglow position reported in GCN 4726 (Mundell et al). The fading X-ray light curve shows 2 strong flares 200 s and 385 s after the BAT trigger. Fitting a power law to the data after the flares gives a late time decay slope of 0.7. The X-ray spectrum from the first orbit (T+103s to T+600s) is well fit by an absorbed power law, with a photon index of 1.93+/-0.03 and a column density of 1.64+/-0.3 e22 cm**-2 in the rest frame of the burst (assuming z = 3.91; Cucchiara et al, GCN 4729), in addition to the Galactic value of 8.5e20 cm**-2. The observed 0.2-10 keV flux is 9.4e-10 ergs cm**-2 s**-1, which corresponds to an unabsorbed flux of 1.3e-09 ergs cm**-2 s**-1. Assuming the X-ray emission from the GRB continues to decay at the same rate, the predicted count rate 24 hrs after the burst trigger is 0.1 count/s, which corresponds to an observed (unabsorbed) 0.2-10 keV flux of 3.4e-12 (4.8e-12) ergs cm**-2 s**-1. This circular is an official product of the Swift XRT Team.