The list of Investigators does not match the STScI records for this program.
0
----- Attempting Submission 1 (Sat Jul 26 00:39:52 GMT 2025) -----
Investigators will be updated to match
WFC3 IR Linearity Monitor
The WFC3/IR detector exhibits a non-linear response to incident flux. The data reduction pipeline provides a correction for the non-linearity, which depends on accurate characterization of the response of the detector. To monitor the non-linearity of the WFC3/IR detector, we use a dark observation followed by two internal flats using the Tungsten lamp at different sampling rates, and a trailing dark. Any changes measured in the non-linearity will be updated in the calibration reference file, crucial to providing a correction for accurate photometry. This program is a continuation of the cycle 32 (program 17678) linearity calibration program, but has signficant changes in Cycle 33 (see proposal description).
Prior monitoring visits consisted of a dark observation followed by two internal flats using the Tungsten lamp through F126N (half SPARS10, half SPARS50) and F127M (half SPARS25, half SPARS10) for a total of 10 orbits. The narrow band flat is used to ensure that the lamp is warm and stable in preparation for the F127M exposure, but not so bright to cause persistence. A trailing dark is obtained to measure the persistence decay rate. This cycle (33), F127M flats will be taken in with SPARS5 and STEP25 to better sample the low fluence end of the linearity curve. Ten orbits in each SAMP-SEQ are needed to reduce systematic uncertainties.
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:visit-id "20"
:orbit-number 1
:pcs-time 0
:si-vis-utilization 0
:al-overhead-at-end 0
:internal-dur-at-end 1712
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2979
:pcs-gap 0
)
true
1
0