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Weekly BIASs/DARKs
We are continuing with our deliveries of the weekly/monthly CCD biases and darks. We have delivered complete sets of biases/darks (GAIN=1, unbinned) for August 11, 1997 through June 27, 2000. We have also delivered biases for binned data (1X2, 2X1, 2X2, 4x1, and 4x2) through February 2000, and for GAIN=4 through June 2000. Photometric Conversion (pht) table updated The low dispersion gratings were updated using revised flux distributions of the white dwarf standard stars.
Spectrum Distortion Correction (sdc) table updated The value of CRPIX2 was modified to no longer shift the field of view to center the target in the x2d file. While this will result in the target not being centered in the x2d image, it will also prevent data from falling off the edges of the x2d image.
Dispersion Coefficient (dsp) table update The dispersion solutions for the FUV-MAMA and NUV-MAMA first order settings have been updated using (in most cases) in-flight data. The changes can be as large as 0.5 pixels (G230L), and as small as 0.02 pixels (G140M/1420).
Photometric Correction (pct) table updated New supported apertures were added to the table. For these apertures, data from other apertures was used as an approximation. Specifically, for the 0.2X0.05ND and 0.3X0.05ND, the 0.2X0.06 was used; for the 6X0.2 and 52X0.2F1, the 52X0.2 was used; for the F25ND3, F25ND5, F25NDQ1, F25NDQ2, F25NDQ3, F25NDQ4, F25MGII, F25QTZ, and the F25SRF2, the 25MAMA was used; for the 50CCD, the 6X6 was used.
1-D Trace (1dt) table updated We have removed 5 spurious traces for the G140M grating (central wavelengths 1218, 1387, 1400, 1540, and 1640). These traces would only impact science data if your spectra was located around pixel 777 on the detector. k7b1651to_1dt.fits |
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