New ETC Release Notes (March 24,2008)
ImageAcqWarning.pdf impacts Proposers Using COS Imaging Target Acquisition ETC to determine exposure times and SNR.
Notice to all COS Proposers (March 6, 2008)
COS backgrounds (when considered versus equivalent STIS ETC cases) are computed too high;
decrease COS NUV background by 5x, decrease COS FUV background by 3x, more.
COS ETC Release Notes Updated (March 5, 2008)
New COS ETC Release Notes
impacts proposers using the COS ACQ/IMAGE ETC (target acquisition ETC).
Notice to all COS Proposers (March 3, 2008)
An error has been found in Chapter 7 of the COS Instrument Handbook,
which discusses acquisitions. Specifically, the exposure times
needed for a successful acquisition are longer than those illustrated
in Figure 7.3. We anticipate that in almost all cases this error
will not affect the time needed in a Phase I proposal because the
total time needed for an imaging acquisition with COS is still very
short. Nevertheless, if the time needed to acquire a source is of
concern, proposers are urged to use the COS Exposure Time Calculator
to estimate the correct acquisition time.
COS ETC Release Notes Updated (February 28, 2008)
New COS ETC Release Notes
impacts proposers using the HST Standard Star Spectra to model the spectral distribution of
their source for COS/FUV observations.
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