GCN Circular 17801
E. Berger, R. Margutti (Harvard), and W. Fong (Univ. of Arizona) report: "We observed the location of the short GRB 150423A (GCN #17728) with the Chandra X-ray Observatory ACIS-S instrument starting on 2015 May 2.308 UT for a total of 23.3 ksec. At the location of the optical afterglow (GCNs #17732, 17733) we detect no significant X-ray emission, and place an upper limit on the count rate of 1.3e-4 cps (1" radius aperture). Using the spectral properties determined from the Swift/XRT data (GCN #17737) we place an upper limit on the flux of the X-ray afterglow at 9.17 days post-burst of 1.7e-15 erg/s/cm^2 (0.3-10 kev). We thank Belinda Wilkes, Harvey Tananbaum, and the Chandra X-ray Observatory staff for approving and carrying out this Director's Discretionary Time observation."