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| STScI Analysis Newsletter (STAN)
| Space Telescope Imaging Spectrograph (STIS)
| August 2014
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In this Newsletter we provide some updates of interest to
STIS users:
Contents:
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A 10% increase in the STIS CCD Readnoise at GAIN=1
Recent monitoring of the STIS CCD readnoise for GAIN=1
has revealed a sudden increase of roughly 10% to 6.25e-
per read. For most users, this impact will be negligible,
with the exception of science programs that require multiple
reads of objects with low signal-to-noise in individual reads
(such as high contrast imaging or spectroscopy of objects
with highly wavelength variable spectral energy distributions).
The STIS team is in the process of updating the read noise
values used in both the ETC and CalSTIS. There will also be
continued investigation into the potential reason for this increase.
PIs of pending STIS CCD programs that use GAIN=1 should
verify that their science programs are not adversely affected
by this change. If so, they should immediately contact their
program point of contact or the help desk.
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| The Space Telescope Science Institute is operated by the
| Association of Universities for Research in Astronomy,
| Inc., under NASA contract NAS5-26555.
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