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Time descriptions of transient event and observation

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* = required

trigger_timestringTime of the trigger [ISO 8601], ex YYYY-MM-DDTHH:MM:SS.ssssssZ
observation_startstringStart time of the observation [ISO 8601]
observation_stopstringStop time of the observation [ISO 8601]
observation_livetimenumberLivetime of the observation [s]
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