TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3686 SUBJECT: GRB050709: Second Epoch Chandra Observation DATE: 05/07/27 01:26:13 GMT FROM: Angelo Antonelli at Obs. Astro. di Roma L.A. Antonelli, M.L. Conciatore (INAF/OAR), D. Malesani (SISSA), S. Covino, P. D'Avanzo, S. Campana, G. Tagliaferri (INAF/OABr), M. Della Valle (INAF/OAA), F. Fiore, G.L. Israel, L. Stella (INAF/OAR), G. Chincarini (Univ. Milano-Bicocca), report on behalf of the MISTICI collaboration: The Chandra X-ray observatory observed a second time the field of the GRB 050709 (Butler et al., GCN 3570; Boer et al., GCN 3653). The observation, performed with ACIS, started on 2005 Jul 25.86234 UT and ended on 2005 Jul 26.09042, for a total exposure time of 18284 s. The X-ray source reported by Fox et al. (GCN 3585) and coincident with the proposed optical counterpart (Jensen et al., GCN 3589; Price et al., GCN 3612) is still marginally detected in the second epoch. We obtained for this source a count rate of (8.4+/-3.5)E-4 cts/s in the (0.3-8.0 keV) band. This count rate compared to the one obtained in the previous observation in the same band (1.2+/-0.2)E-3 cts/s (Fox et al., GCN 3585) does not allow us to firmly establish any variability for the proposed X-ray afterglow. This message can be cited.