The following log includes the dates of publication and lists sections containing major updates for all current and past versions of the handbook. The current version is listed at the top in bold font. 

v6.2.2        Oct. 11, 2018        DCS link URLs updated
v6.2.1       June 15, 2018        Section 8.1: Table 8.1 sensitivity values updated.
v6.2.0       Nov. 15, 2017         Sections 1.1–1.3, 5.2, 7.2, & 8.2.
v6.1.1       June 5, 2017          No major updates.
v6.1.0       May 1, 2017           Observer's Handbook for Cycle 6 released.

New versions of the Observer's Handbook from Cycle 6 onward will follow the following schedule of releases:

Observer's Handbook Versions
Version Coincides with Approx. Annual Publish Date
6.1.0 Call for Proposals end of April
6.1.1 Update to Call for Proposals June
6.2.0 Phase II begins October
6.2.x Phase II Concludes January
Versions have the format (Observing Cycle).(Phase).(Revision). Intermediate revisions may be released until the conclusion of Phase II.
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