The announcement provides an amendment to the Astrophysics Explorers Program 2026 Small Explorer (SMEX) Announcement of Opportunity, including revised final text and an email attachment. The final AO text is now available for download on NSPIRES. Interested parties are responsible for monitoring the listed sites for updates and must read the attached PDF files. The solicitation includes a mandatory Notice of Intent and a virtual preproposal conference. Questions must be submitted via email to the listed contacts using a specified subject line.

NASA has released the final text for the 2026 Astrophysics Small Explorer (APSMEX) opportunity, available for download via NSPIRES. A mandatory Notice of Intent and a virtual preproposal conference are required prior to the proposal due date. All questions must be submitted via email to the listed contacts with "APSMEX26" in the subject line. No specific budget amount or performance location is specified in this description. Interested parties should monitor the solicitation sites for amendments and updates.