During the last week, the observing schedule was interrupted due to high radiation associated with solar activity. The loads were autonomously halted at 283:03:34 (Oct 08 11:34 p.m. EDT) by the ACIS radiation monitor through execution of SCS 107 for SI safing. All spacecraft actions were nominal. Real-time procedures were executed on Oct 09 to disable SCS-29, which was enabled during the safing sequence, and to change the ObsID. A further real-time procedure was executed on Oct 10 to start an ACIS external calibration source measurement during the radiation shutdown. Planned observations that were impacted by the interruption will be rescheduled.

Another real-time procedure was executed on Oct 11 to uplink a patch to change the orientation of the spacecraft during Normal Sun Mode. With this patch, the spacecraft will autonomously orient the body of the spacecraft to a pitch of 160 degrees while leaving the solar array normal to the Sun. This improves thermal management during Normal Sun mode activities.

Chandra press and image releases were issued on Oct 09 describing the use of Chandra in combination with HST, NICER, and Swift to study the tidal disruption event AT2019qiz. The combined observations allowed the team to determine the size of the disk around the supermassive black hole. They found that the disk had become large enough that if any object were orbiting the black hole with a period of about a week or less, it would collide with the disk and cause eruptions. For details, see* https://chandra.si.edu/press/24_releases/press_100924.html

The schedule of targets for the next week is shown below and includes an observation of AT2024wpp, which was accepted as a Director's Discretionary Time Target of Opportunity on Oct 3 and is coordinated with NuSTAR, and an observation of SDSS J094533.99+100950.1 coordinated with HET.