During the last week Chandra completed the observing schedule as planned.

Real-time procedures were executed Jul 30 - Aug 2 to dump OBC-A and -B memory as a follow-up to the patches uplinked on Jul 30. The dumps will be used to update the baseline memory images maintained on the ground. Another real-time procedure was executed on Aug 1 to swap the prime solid-state recorder (SSR) from the A-side to the B-side. This swap concludes a six-month interval of health and trending data collection on SSR-A. Additional real-time procedures were executed on Aug 4 to perform a routine self-check of the Electrical Interface Assembly (EIA) Sequencer and to perform a diagnostic dump of the Control Processing Electronics (CPE).

A Chandra image release was issued on Aug 5 to present data on the black hole in V404 Cygni from Chandra and from other telescopes. V404 Cygni is a binary system in which a less massive star orbits the black hole leading to occasional bursts of X-rays. This burst created high-energy rings, a phenomenon known as light echoes. The light echoes around V404 Cygni were produced when the X-rays from the black hole system bounced off of dust clouds between V404 Cygni and Earth. The rings can be used to understand information about not only about the black hole's behavior, but also about the material between V404 Cygni and Earth. For more details see: https://chandra.harvard.edu/photo/2021/v404cyg/

The schedule of targets for the next week is shown below and includes an observation of IGR J16318-4848 coordinated with NuSTAR, and observations of GRB210726A, which are follow-up to a Target of Opportunity accepted on Jul 27.