IRAC Instrument Handbook - IRSA - California Institute of Technology

IRAC Instrument Handbook
FUL_2s_2sf4d1r1_ch[1-4]_v1.2.0_dark_noise.fits IRAC labdark noise image
HDR_30s_1.2sf1d1r_ ch[1-4]_v1.2.0_dark.fits IRAC labdark image (HDR short frame)
HDR_30s_30sf16d1r_ ch[1-4]_v1.2.0_dark.fits IRAC labdark image (HDR long frame)
SUB_0.1s_0.1sf2d1r1_ch[1-4]_v1.2.0_dark.fits IRAC labdark image (subarray)
irac_b[1-4]_[fa/sa]_superskyflat_finalcryo_091004.fits IRAC superskyflat image
irac_b[1-4]_
IRAC superskyflat mask file
[fa/sa]_superskyflat_finalcryo_091004_cmask.fits
irac_b[1-4]_[fa/sa]_20020921_lincal.fits linearization calibration image
irac_b[1-4]_[fa/sa]_20020921_lincal_cmask.fits linearization calibration mask
irac_b[1-4]_[fa/sa]_cdelt12_distort.tbl Array distortion table
irac_b[1-4]_[fa/sa]_16_118_muxbleed_coeff_112003 Muxbleed correction coefficients
irac_b[1-4]_[fa/sa]_16_118_muxbleed_lut_100102 Muxbleed correction look-up table
[month][year]_ch[1-4]_pmask_[subarray].fits Pmask (nearest in time)
[month][year]_ch[1-4]_fa_pmask[subarray]_flip.fits Flipped pmask (nearest in time; not in use)
irac_b[1-4]_fa_slmodel_v1.0.1.fits Subtracted scattered light model
irac_b[1-4_ fluxconv_10112010.tbl Flux conversion file used
instrument_FOV.tbl IRAC array locations in Spitzer FOV
irac_b[1−4]_mosaicPRF.fits PRF file used for pointing refinement
irac_b[1−4]_PRF.tbl PRF used for the four quadrants of the image
SPITZER_I1_21752576_0000_5_A41882936_avg.fits Average image of all BCDs in an AOR
SPITZER_I1_21752576_0000_5_A41882938_avmed.fits Average image of all HDR intermediate
frames
SPITZER_I1_21752576_0000_5_A41882937_ashrt.fits Average image of all HDR short frames
SPITZER_I1_21752576_0000_5_C8232029_mdn.fits Median image of all BCDs in an AOR
SPITZER_I1_21752576_0000_5_A41882940_mdmed.fits Median image of all HDR intermediate
frames
SPITZER_I1_21752576_0000_5_A41882939_mshrt.fits Median image of all HDR short frames
6.2 IRAC Specific Header Keywords
Here we describe some of the important header keywords. A complete IRAC image header description is
included in Appendix D.
AORLABEL is the name of the AOR as it was defined by the user in Spitzer Observation Planning Tool
Spot when the observations were requested. The P.I. of a program under which the data were taken will
be listed as the OBSRVR of each project. AORKEY is a unique identification number or “digit sequence”
for each observation; it is also part of the filename for each BCD. EXPID is an exposure counter
incremented within a given AOR for each data-taking command. Most data-taking commands generate
multiple files: one per array in full array mode. The DCENUM is a counter of individual frames (per
wavelength) from an individual command; it can be used to separate frames generated with internal
repeats. The only observations with non-zero DCENUM are channel 4 BCDs for 100/200 second frame
time (taken as two/four 50 second frames). In high dynamic range mode, the long and short exposures are
generated with independent commands and have different EXPIDs. Thus, for example, data from 12second
high dynamic range observations can be separated into long and short frames using the `odd' or
Data Products 99 IRAC Specific Header Keywords