IRAC Instrument Handbook - IRSA - California Institute of Technology

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IRAC Instrument Handbook Figure 5.7: First-frame effect. Dark counts as a function of interval between frames. This figure is for a 30 second exposure frame. The second step of the dark subtraction uses a delta-dark found in the SKYDARKSUB module described below. This “skydark”, described in Section 4.1, is subtracted from the IRAC image after the linearization Pipeline Processing 79 Level 1 (BCD) Pipeline
IRAC Instrument Handbook and should take away any additional dark features which are not present in the labdarks, but exist in the flight data. Note that the delta-dark includes the sky background around the low-zody region. 5.1.11 MUXBLEEDCORR (electronic ghosting correction) The InSb arrays suffer from an effect known as “muxbleed". This is believed to be a result of operating the arrays at unusually cold temperatures. When a bright source is read out, the cold electronics do not return to their quiescent state for a considerable length of time. The result is a ghosting along the pixel readout channels, sometimes referred to as “ant trails" (Figure 5.8). The effect is easily noticeable against a low background (such as a dark current measurement), and can extend the full length of the array. The muxbleed flux is not real − it is not “borrowed" from the actual source and as such needs to be accounted for, or removed, unlike CTE smearing in CCDs. Figure 5.8: Correction of pseudo-muxbleed for channel 1. Shown is a bright source within a calibration AOR and a background of sources unde r the muxblee d limit. This effect is complicated. It appears that a pixel bleeds only as a result of the light falling onto it, and not as the sum of the value of the pixel plus the bleeding from previous pixels. Since we know the readout order of the pixels, we can start by correcting all pixels downstream from the first pixel, and then move on to the next pixel. The exact shape of the mubleed pattern, obtained after examining hundreds of muxbleed incidences is summarized as a modified polynomial: Log(MuxbleedIntensity) = 3.1880 – 2.4973x +1.2010x 2 − 0.2444x 3 (5.9) Pipeline Processing 80 Level 1 (BCD) Pipeline
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IRAC Instrument Handbook Spitzer He
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iii IRAC Instrument Handbook 4.8 CA
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v IRAC Instrument Handbook 8.1.4.5
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IRAC Instrument Handbook Astronomic
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2 Instrument Description 2.1 Overvi
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Pickoff Mirror IRAC Instrument Hand
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solving for F, we find ΣI P F = Σ
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IRAC Instrument Handbook Figure 2.5
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Instrument Description 12 Detectors
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Instrument Description 14 Electroni
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IRAC Instrument Handbook into a red
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f ex (throughput correction for bac
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The noise pixels, Npix , are define
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3 Operating Modes IRAC Instrument H
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IRAC Instrument Handbook The "splot
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8 Introduction to Data Analysis 8.1
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IRAC Instrument Handbook can be mor
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Appendix A. Pipeline History Log S1
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S18.0 Pipeline History Log 140 IRAC
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Pipeline History Log 142 IRAC Instr
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Performing Photometry on IRAC Image
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Performing Photometry on IRAC Image
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C.1 Use of the Five Times Oversampl
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Point Source Fitting IRAC Images wi
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IRAC BCD File Header 168 IRAC Instr
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DN Data Number. FET Field Effect Tr
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WCS World Coordinate System. Acrony
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Collaborators Construction and grou
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Margaret Drennan, Graduate Student
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Darron Harris, Mechanical Technicia
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Dick Bolt, Flight Assurance Jerry B
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Charles Stone, Harness Technician I
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Caltech (California Institute of Te
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List of Figures 190 IRAC Instrument
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Appendix I. Version Log Version 2.0
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Bibliography 198 IRAC Instrument Ha
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channel, 4, 6, 9, 24, 25, 26, 36, 4
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IRAC Instrument Handbook - IRSA - California Institute of Technology

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