TITLE: GCN CIRCULAR NUMBER: 29038 SUBJECT: Long-lasting X-ray emission from GW170817 detected by Chandra DATE: 20/12/14 12:29:41 GMT FROM: Eleonora Troja at NASA/GSFC/UMD E. Troja (UMD/GSFC), L. Piro (INAF/IAPS), G. Ryan (UMD), B. O' Connor (UMD/GWU), H. van Eerten (U. Bath), T. Sakamoto (AGU) report: We analyzed the latest Chandra observations of GW170817 carried out between Dec 09 and Dec 13, 2020 for a total exposure of about 65 ks (out of 100 ks approved for program 21510449; PI: Margutti) At the transient position we detect a total of 9 counts within a circular region of 1 arcsec radius, corresponding to a count rate (1.5 +/- 0.5)E-04 cts/s (0.5-8.0 keV). This is slightly higher than the value measured at 940 days (0.8 +/- 0.3)E-04 cts/s (Troja et al., 2020, MNRAS, 498, 5643) and consistent within the errors. By using a power-law spectrum with photon index Gamma=1.57, we derive an X-ray flux of (2.6 +/- 0.9)E-15 erg/cm2/s. Further analysis is on-going.