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Knowledgebase: IRAC
I have heard of a non-standard observing mode (not an AOR).How do I tell if the data were taken using this non-standard mode? What are some of the characteristics of the BCDs obtained with the non-standard mode?
Posted by Seppo Laine on 29 January 2009 12:14 PM

Technically challenging observations (e.g., long-term monitoring) may have been converted to Instrument Engineering Requests, IERs, from the submitted Astronomical Observation Requests, or AORs. To tell whether your data are from an AOR or IER, look at the BCD header keyword "REQTYPE". Its possible values are "AOR", "IER", or "SER" (you should not see the last type). The IRAC IERs with repeats and frame times greater than 2 seconds will not have a BCD for EXPID=0.