On Jul 23, we celebrated the 25th anniversary of Chandra's launch and 25 years of successful scientific operations. The spacecraft and instruments continue to operate superbly and we look forward with excitement to the coming year of science discovery!

During the last week the observing schedule was interrupted due to high radiation associated with solar activity. The loads were autonomously halted at 11:12pm on Jul 22 by the ACIS radiation monitor through execution of SCS 107 for SI safing. All spacecraft actions were nominal. Loads for a replanned schedule were uplinked on Jul 25 for a return to science observations on Jul 26. Planned observations that were impacted by the interruption will be rescheduled.

Real-time procedures were executed on Jul 23 to disable SCS-29, which was enabled during the safing sequence. A further real-time procedure was executed on Jul 23 to start an ACIS external calibration source measurement during the radiation shutdown.

Chandra press and image releases were issued on Jul 22 to celebrate the 25th anniversary of Chandra's launch, by releasing 25 never-before-seen views of a wide range of cosmic objects. The new set of images samples the almost 25,000 observations Chandra has taken during its quarter century in space. These images demonstrate how X-ray astronomy explores all corners of the universe. By combining X-rays from Chandra with other space-based observatories and telescopes on the ground, as many of these images do, astronomers can tackle the biggest questions and investigate long-standing mysteries across the cosmos. Chandra science has led to over 700 PhDs and has supported a diverse talent pool of more than 3,500 undergraduate and graduate students, about 1,700 postdocs and over 5,000 unique principal investigators throughout the U.S. and worldwide. Scientists have written over 10,000 peer-reviewed and accepted papers based on Chandra data, gathering almost half a million citations, making it one of the most productive NASA missions in astrophysics. For details, see https://chandra.si.edu/press/24_releases/press_072224.html

The schedule of targets for the next week is shown below and includes observations of SS433 coordinated with Swift and observations of NGC3783 coordinated with XRISM.