IRAC Instrument Handbook - IRSA - California Institute of Technology

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IRAC Instrument Handbook observation was designed (using Spot). The “.aor" file for a planned or performed observation can be retrieved using the “view program" feature of Spot. (You will be prompted for the program name or ID, which can be obtained from the image header keywords PROGTITLE and PROGID). Here is an example AOR file: # Please edit this file with care to maintain the # correct format so that SPOT can still read it. # Generated by SPOT on: 5/9/2003 12:10:9 HEADER: FILE_VERSION=7.0, STATUS = PROPOSAL AOT_TYPE: IRAC Mapping AOR_LABEL: IRAC-FLS-CVZ-a AOR_STATUS: new MOVING_TARGET: NO TARGET_TYPE: FIXED SINGLE TARGET_NAME: FLS-CVZ COORD_SYSTEM: Equatorial J2000 POSITION: RA_LON=17h13m05.00s, DEC_LAT=+59d10m52.0s OBJECT_AVOIDANCE: EARTH = YES, OTHERS = YES READOUT_MODE: FULL_ARRAY ARRAY: 3.6_5.8u=YES, 4.5_8.0u=YES HI_DYNAMIC: NO FRAME_TIME: 12.0 DITHER_PATTERN: TYPE=Cycling, N_POSITION=5, START_POINT=1 DITHER_SCALE: small N_FRAMES_PER_POINTING: 1 MAP: TYPE=RECTANGULAR, ROWS=7, COLS=6, ROW_STEP=277.0, COL_STEP=280.0, ORIENT=ARRAY, ROW_OFFSET=0.0,COL_OFFSET=440.0,N_CYCLE=1 SPECIAL: IMPACT = none, LATE_EPHEMERIS = NO,SECOND_LOOK = NO RESOURCE_EST: TOTAL_DURATION=5848.4, SLEW_TIME=1089.0, SETTLE_TIME=1045.0, SLEW_OVERHEAD=180.0, SPECIAL_OVERHEAD=0.0, UPLINK_VOLUME=9026, DOWNLINK_VOLUME=59065440, VERSION=S7.0.B2 INTEGRATION_TIME: IRAC_3_6=60.0,IRAC_4_5=60.0,IRAC_5_8=60.0,IRAC_8_0=60.0 For this AOR, there are 210 files (6 columns x 7 rows x 5 dither positions) of each type for each channel. The final data products from this AOR in channel 2, provided it got assigned the AORKEY 6213376, are as follows: SPITZER_I2_0006213376_0000_0000_01_dce.fits SPITZER_I2_6213376_0000_0000_1_bcd.fits SPITZER_I2_6213376_0000_0000_1_cbcd.fits SPITZER_I2_6213376_0000_0000_1_bcd.log SPITZER_I2_6213376_0000_0000_1_bunc.fits SPITZER_I2_6213376_0000_0000_1_cbunc.fits SPITZER_I2_6213376_0000_0000_1_bdmsk.fits SPITZER_I2_6213376_0000_0000_1_bimsk.fits SPITZER_I2_6213376_0000_0000_1_brmsk.fits SPITZER_I2_6213376_0000_0000_1_ptn.log .... SPITZER_I2_0006213376_0209_0000_01_dce.fits SPITZER_I2_6213376_0209_0000_1_bcd.fits Data Products 101 IRAC Specific Header Keywords
SPITZER_I2_6213376_0209_0000_1_cbcd.fits SPITZER_I2_6213376_0209_0000_1_bcd.log SPITZER_I2_6213376_0209_0000_1_bunc.fits SPITZER_I2_6213376_0209_0000_1_cbunc.fits SPITZER_I2_6213376_0209_0000_1_bdmsk.fits SPITZER_I2_6213376_0209_0000_1_bimsk.fits SPITZER_I2_6213376_0209_0000_1_brmsk.fits SPITZER_I2_6213376_0209_0000_1_ptn.log IRAC Instrument Handbook After the name of the telescope, the first partition gives the instrument (“I" = IRAC), and the number after the “I" gives the channel (in this case, 2). The next part gives the AORKEY, then we have the EXPID, DCENUM, and the version number (how many times these data have been processed through the pipeline). One should generally use only the data from the highest version number, in case multiple versions have been downloaded from the archive. To verify that the data are from the latest pipeline version, check the CREATOR keyword in the header (S18.18 for the final cryogenic IRAC data processing). Finally, there is a group of letters that specify what kind of data are in the file (see Table 6.1 above), and the file type (usually “fits" or “log"). The post-BCD file names include telescope name (SPITZER), “I" (for “IRAC"), the channel number, the productid (not the same as the AORKEY), the DCENUM, the (pipeline) version, “ensemble product id,” the type of the data and the suffix. In the case of an ensemble product, “DCENUM" in the filename refers to the first DCE that was used in the ensemble creation, and “version” refers to the version of that first DCE. The letter “C” stands for “calibration" product: in the case of a calibration product, “DCENUM" refers to the first DCE that was used in the calibration creation, (pipeline) “version” refers to the version of that first DCE, and number after the “C” letter is the “calibration number". Note that for a given AORKEY of science data being retrieved, the AORKEY for the associated calibration products is different. A list of 2MASS sources for the field of the IRAC observation is included in the data delivery as *irsa.tbl. Note that the 2MASS magnitudes given in the *irsa.tbl file are not meant for scientific use. For scientific use of the 2MASS data, query the 2MASS catalog directly from IRSA, and take into account the flux quality flags. Data Products 102 IRAC Specific Header Keywords
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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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2 32 38 150 92 0.6 a 180 210 630 25
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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 spacing ha
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Figure 3.1 : IRAC dither patterns f
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Calibration 32 Flat Fields IRAC Ins
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IRAC Instrument Handbook All of the
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IRAC Instrument Handbook The calibr
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IRAC Instrument Handbook the wavele
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Table 4.6: Color corrections for NG
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IRAC Instrument Handbook flux densi
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4.7.1 Core PRFs IRAC Instrument Han
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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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