GCN Circular 4733
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.