TITLE: GCN CIRCULAR NUMBER: 21396 SUBJECT: GRB 170714A: Chandra observations DATE: 17/07/31 12:35:17 GMT FROM: Eleonora Troja at GSFC E. Troja (NASA/UMCP), L. Piro (INAF/IASF), B. Gendre (UVI) report on behalf of a larger collaboration: We observed the field of the ultralong GRB 170714A (D'Ai et al., GCN 21340) with the Chandra X-ray Observatory beginning on 2017 Jul 28.67 UT (14 days post-burst) for a total exposure of 14.9 ks. We clearly detect the GRB counterpart with coordinates: RA(J2000) = 02:17:23.97 Dec(J2000) = +01:59:29.72 with a 68% uncertainty of 0.5 arcsec. This position is consistent with the XRT position (http://www.swift.ac.uk/xrt_positions/00762535/), and the optical source reported by de Ugarte Postigo et al. (GCN 21346). By adopting the spectral parameters of the Swift/XRT analysis (D'Avanzo et al., GCN 21343), we estimate an average X-ray flux of ~1.1E-14 erg/cm2/s during our observation. This is consistent with a late-time power-law decay of slope ~-1. We thank Andrea Prestwich, Belinda Wilkes and the CXC staff for rapidly scheduling this observation.