TITLE: GCN CIRCULAR NUMBER: 6627 SUBJECT: GRB070714B: Swift-XRT refined analysis DATE: 07/07/15 03:33:26 GMT FROM: Judith Racusin at PSU J. Racusin, J. Kennea, C. Pagani, L. Vetere (PSU), and P. Evans (U. Leicester) report on behalf of the Swift/XRT team: We have analyzed the first 15 ks of Swift XRT PC and WT data from GRB 070714B (Racusin et al., GCN 6620). Using 770 s of overlapping XRT Photon Counting mode and UVOT V-band data, we find an astrometrically corrected X-ray position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 57.84287, 28.29782 which is equivalent to: RA (J2000): 03h 51m 22.29s Dec (J2000): +28d 17' 52.2" with an uncertainty of 1.8 arcsec (90% confidence, radius). This is 35 arcsec from the refined BAT position (Barbier et al., GCN 6623), and 1.4 arcsec from the Liverpool optical afterglow candidate (Melandri et al., GCN 6621). The XRT light curve shows a fading behavior with super-imposed small flaring. The light curve can be fit with a power-law beginning with a steep decay with a slope of 2.49 +/- 0.18 followed by a plateau beginning at 413s +/- 50s with a slope of 0.60 +/- 0.29 until another break at 1187 +/- 270s with a decay of 1.73 +/- 0.11. The X-ray PC and WT spectrum is well fit by an absorbed power law with a photon index for 1.2 +/- 0.1 and a column density of 13 +/- 3 e20 cm^-2 in excess of the galactic value (6.4e20 cm-2). The absorbed (unabsorbed) 0.3-10.0 keV flux of the WT spectrum is 9.2e-10 (1.0e-9) erg cm^-2s^-1 and the flux of the PC spectrum is 3.4e-12 (3.7e-12) ergs cm^-2 s^-1. Assuming the source continues to decay at the same rate, we predict an XRT count rate of 2.7e-4 counts/s at T0+24 hours, which corresponds to an observed (unabsorbed) flux of 1.8e-13 (2.0e-13) ergs cm^-2 s^-1. This circular is an official product of the Swift XRT team.