Observation ID (ObsID) ○

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Observation ID (ObsID) ○｜Definition｜1st｜20251021194916-00-⌔

Dictionary: ObsID: Observation Id - CIAO 4.17

ObsID: Observation Id

Every Chandra observation is assigned an Observation Id (ObsID), which indicates that it is an observation of a specific target for a specific proposal with a specific observational configuration. All data for a given ObsId are always combined into a single set of Level=2 products. Each ObsId contains one or more Observation Intervals.

For more information, see the Multi-part Observations section of the Chandra Standard Data Distribution Contents page.

There are many ways to refer to an observation:

  Proposal Number maps to
       N x Sequence Numbers maps to
       M x ObsIDs maps to
            Q x OBIs

where it is almost always true that N == M (i.e. there is one ObsID per Sequence Number).

Printed 2026-06-28.

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