Overview

The Caltech Continuum Backend (CCB) YGOR manager produces a single data file in FITS format per YGOR scan, as is the current practice for backends at the GBT. This FITS file complies with standards and practices laid out in GBT/SPN/004 ``Device and Log FITS Files for the GBT'', with additions and modifications dictated by the CCB itself.

The CCB FITS file comprises:

• A primary header data unit (PHDU) with no data (NDIM=0 or NAXIS1=0). The PHDU contains general information about the observation such as scan number, scan type, date, and time. It also contains keywords whose values describe the configuration of the backend.
• A binary table extension (the PORT table) describing the inputs to the backend.
• A binary table extension (the CCBSTATE table) describing the beamswitched phases of data found in the data table (see below). The CCBState table is a modified form of standard GBT State tables.
• A binary table extension called the Data table with integration data, consistent with current GBT practice and intent.

All of these tables are standard to GBT FITS files described in SPN/004, or variations upon them.