On October 21, 2016, the National Aeronautics and Space Administration (NASA) Science Mission Directorate (SMD) is releasing three amendments for Astrophysics Explorers Science Investigations.

Release Date: October 21, 2016
Notice of Intent to Propose Due: October 27, 2016
Proposals Due: December 15, 2016

1. Identification Number: NNH16ZDA010O (Medium Explorer AO): Amendment 1
2. Identification Number: NNH12ZDA006O-APEXMO3 (Amendment 17 to the SALMON-2 AO: Astrophysics Explorers Mission of Opportunity Solicitation)
3. Identification Number: NNH16ZDA001N-APEX USPI (Amendment 40 to the ROSES-16 NRA: Astrophysics Explorers U.S. Participating Investigators)

Three amendments as itemized above will be released on or about October 21, 2016.

These amendments all delay the required Notice of Intent (NOI) to propose due date to October 27, 2016. The proposal due date for all of the above listed solicitations remains unchanged at December 15, 2016.

Comments and questions may be addressed in writing or by E-mail to: Dr. Wilton T. Sanders, Astrophysics Explorers Program Scientist, Astrophysics Division, Science Mission Directorate, NASA Headquarters, Washington, DC 20546-0001; E-mail: [email protected] (subject line to read “Astrophysics Explorers MIDEX AO” or “Astrophysics Explorers MO PEA” or “APEX USPI” as appropriate); Phone: 202-358-1319; FAX: 202-358-3062. Responses to all inquiries will be answered by E-mail and also posted to the Questions and Answers (Q&A) location of the 2016 Astrophysics Explorers Program Acquisition website at http://explorers.larc.nasa.gov/APMIDEX2016; anonymity of persons and institutions who submit questions will be preserved.