Latest ESO Call for Proposal
The ESO Call for Proposal is issued twice a year, at the beginning of March (for observations to be carried out between October 1 of the current year and March 31 of the following year) and at the beginning of September (for observations to be carried out between April 1 and September 30 of the year following the release of the Call). You can find the precise date of the latest Call for Proposal at the ESO Phase 1 page.
Proposals must be submitted by the respective deadline (end of March and end of September) using the Web-based p1 interface accessible at www.eso.org/p1. Accessing p1 requires a ESO User Portal account. You can find find more info about the ESO User Portal in this article and at the ESO User Portal page.
Up to 5% of the general observing time may be used for Director's Discretionary Time Proposals (DDT proposals). For detailed information about DDT proposals see the separate DDT Proposal page. As of 1 April, 2019 proposals must be submitted via the p1 interface (instructions can be found here).
For sudden astronomical events requiring urgent or even immediate observations, detailed requests can be submitted. A detailed description of ESO's "Target of Opportunity" POLICY (ToO) is given in a separate document. Please read it carefully before submitting any ToO.