IRAC Instrument Handbook - IRSA - California Institute of Technology

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2 190 200 1400 740 0.6 630 650 4600 2500 0.4* 950 980 6950 3700 0.4** 1000 820 3100 2300 0.1** 4000 3300 13000 9000 0.02** 20000 17000 63000 45000 *stellar mode; **subarray mode IRAC Instrument Handbook The zodiacal background only makes a difference for long frames in channel 4 when observing near the ecliptic plane. If the bright extended source extends well beyond the 5.2´×5.2´ FOV, then the saturation brightness is lower by the factor fs. Instrument Description 25 Sensitivity and Saturation
3 Operating Modes IRAC Instrument Handbook The IRAC Astronomical Observation Template (AOT) consists of an (optional) dither pattern superposed on an (optional) rectangular-grid raster. 3.1 Readout Modes and Frame Times During Cryogenic Operations In full-array readout mode, there were four selectable frame times: 2, 12, 30, and 100 sec (and a fifth, 200 sec, during the early mission). To allow sensitive observations without losing dynamic range, there was a high dynamic range (HDR) option. When this option was selected, the IRAC AOT took extra frames, with frame times shorter than the selected frame time.The HDR frame times are given in Table 2.6. No spacecraft repositioning was done between frames, and the frames always were taken from shortest to longest. If dithers were selected, then the entire frame set was repeated at each dither position. Stellar photometry mode was available for observations of objects much brighter in channels 1 and 2 than in 3 and 4 (typically stars). This mode took short exposures in channels 1 and 2, and long exposures in channels 3 and 4. Originally developed as engineering observations for taking calibration stars, this mode was available for all observers. Three framesets were available. The shortest set took a single 0.4 sec frame in channels 1 and 2, and a 2 sec frame in channels 3 and 4. The next set took two undithered 2 sec frames in channels 1 and 2, and a 12 sec frame in channels 3 and 4. The longest frame time combination took two undithered 12 sec frames in channels 1 and 2, and a 30 sec frame in channels 3 and 4. The sensitivities of each frame are identical to those in full array mode. Dithering and mapping were also available in this mode. For very bright sources, a subarray mode was available. In this mode, only a small 32×32 pixel portion of the array was read out, so the field of view was only 38”×38”. Mapping was not allowed in subarray mode. However, small maps could be made using a cluster target. In subarray readout mode, there were three selectable frame times: 0.02, 0.1, and 0.4 sec. For one commanded image in subarray mode, a set of 64 Fowler-sampled frames were taken in succession, so that each time an image was commanded in subarray mode, a cube of 64×32×32 pixel images was generated. This means that the durations of a single repeat at each of the three subarray frame times were 1.28, 6.4, or 25.6 sec, respectively. The IRAC AOT moved the telescope to point to the subarray region of each requested channel at the target in turn. For the 0.02 sec frame time, data rate limitations allowed only data in the channel actually pointing at the target to be taken. For the 0.1 sec and 0.4 sec frame times, data were taken in all four channels at each pointing position, although only one channel at a time pointed at the target. Operating Modes 26 Readout Modes and Frame Times During Cryogenic Operations
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8 Introduction to Data Analysis 8.1
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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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