SOFIA Cycle 3 Call for Proposals The Stratospheric Observatory for Infrared Astronomy (SOFIA) Cycle 3 observing Call for Proposals (CfP) has been released. The Call solicits observing proposals from the U.S. and international astronomical community for up to 450 hours of science observing using SOFIA, and is issued on behalf of NASA by the Universities Space Research Association (USRA). The deadline for submitting proposals is July 18, 2014. Proposal selections will be announced in October 2014, and the Cycle 3 observing period will be from March 1, 2015 to January 31, 2016. The proposal process consists of two phases. Phase I requires the preparation and submission of a scientific context, a scientific justification, a feasibility analysis and a high-level description of the proposed targets and observations. Peer review and proposal selection will be based on the Phase I submission. Proposers who are awarded time will be required to submit detailed observation specifications during Phase II. A formal update to the CfP on this website is scheduled for June 20, 2014. That update will include information about some instrument sensitivities gained by analysis of data from recently concluded commissioning flights. However, no major changes in capabilities are expected relative to those described in the current version of the Cycle 3 CfP document. The SOFIA Cycle 3 Call for Proposals document, links to the Observer's Handbook for Cycle 3, and other details about preparing and submitting a proposal may be found at the "Cycle 3: Phase I Information" link: http://www.sofia.usra.edu/Science/proposals/cycle3/SOFIA_Cycle3_CfP.pdf SOFIA is a joint project of NASA and the German Aerospace Center (DLR). The aircraft is based at the NASA Armstrong Flight Research Center's facility in Palmdale, Calif. NASA Armstrong Flight Research Center manages the program. NASA Ames Research Center at Moffett Field, Calif., manages the SOFIA science and mission operations in cooperation with the Universities Space Research Association (USRA) headquartered in Columbia, Md., and the German SOFIA Institute (DSI) at the University of Stuttgart.