TITLE: GCN GRB OBSERVATION REPORT NUMBER: 5414 SUBJECT: GRB 060805B: X-ray Afterglow Detection, Spectral/Spatial/Temporal Properties DATE: 06/08/07 17:45:13 GMT FROM: Nat Butler at MIT/CSR N. Butler (UC Berkeley) reports: We report the results of a spectral/spatial/temporal analysis of the Swift target-of-opportunity observation of the X-ray afterglow to GRB060805B (GCN 5407). We detect a bright and fading X-ray source <~0.7 arcmin from the center of the IPN error region. Using 130 cts (0.3-10 keV) from a total exposure of 16.7 ksec for the time interval 126-164 ksec after the IPN trigger, the count rate fades as t^-alpha, with alpha=-2.4+/-1.1. The spectrum is fit by an absorbed powerlaw, with column density N_H = (1.3+/-1.1) 10^21 cm^-2, consistent with the Galactic value in the source direction. Also, we find photon index Gamma=2.1+/-0.4 and unabsorbed flux (4.4+/-1.1) 10^(-13) erg cm^-2 s^-1. We determine the following position for the transient, with respect to the DSS positions of 23 optical sources and the XRT positions of 7 X-ray sources and including an estimate of the systematic error: RA, Dec: 18 10 05.41 +58 09 18.1 ; +/- 2.6" (J2000, 90% Conf.) We note that the X-ray source is near but not spatially consistent with a R~18.5 mag source in the DSS at RA, Dec: 18 10 5.64, +58 09 19.4.