Cosmic Origins Spectrograph Instrument Handbook for Cycle 17

12.2 NUV TIME-TAG Data

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12.2.1 Raw NUV TIME-TAG Data

For the NUV, no pulse heights are recorded, and so the raw data consist of t, x,
and y.

12.2.2 Corrected NUV TIME-TAG Data

For the NUV, the corrected array of TIME-TAG events consists of the same as for the FUV except that PHA is not present and the wavelength is in the y direction. Also, NUV TIME-TAG data include YDOPP values, which is the column of y pixel coordinates corrected for orbital doppler shift.

12.2.3 Corrected NUV TIME-TAG Image

A corrected 1024 × 1024 image is formed from the corrected array of TIME-TAG events. The value in each pixel is effective counts sec^-1, which is the sum of all counts in a pixel multiplied by its factor and divided by the exposure duration.

12.2.4 NUV TIME-TAG Error Array

The error array is also 1024 × 1024 and is based on Poisson statistics from the gross counts, correcting for flat field effects and the dead time. The units are effective counts sec^-1.

12.2.5 NUV TIME-TAG Science Spectrum

The one-dimensional science spectrum is a table with the same quantities as for FUV TIME-TAG data.