Dear colleagues,

This is a supplementary notice regarding the 9th Announcement of Opportunity (AO-9) for guest observations with the Insight-HXMT satellite.

Considering that several proposers have encountered difficulties in completing their submissions on schedule, we hereby extend the proposal deadline by one week.

The revised key milestone is updated as follows (UTC-8):

• New deadline for proposal      submission: June 22, 2026

All other schedules, requirements and regulations stated in the original AO document remain unchanged.

We appreciate your attention and look forward to receiving your proposals.

Submit via the website (registration required): http://proposal.ihep.ac.cn/proposal.jspx