Archive Pipeline Products and Filenaming Convention

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IRS products that come out of the engineering pipeline:

File Type	Name SPITZER_S+module*_aorkey_expnum_ dcenum_version_type.suffix	Format	Description
Raw science data cube	SPITZER_S1_9876540_96_0_1_raw.fits	FITS image as 3-D cube with 16-bit integer, 128x128xn (n depends on the Spectral Exp Time) Size: n x 32768 byte + header (typical/maximum value: 550 kbyte)	Pixel values unchanged from the MIPL DCE, but header keywords much reduced in number; some keywords are modified using a keyword dictionary; the modifications include renaming and averaging groups of keywords
Engineering data	SPITZER_S1_9876540_96_0_1_pipe0.fits	FITS image as 3-D cube with 32-bit real, 256/128x128xn Size: 280 kbyte	Output of the engineering pipeline, whose header is then modified by the pointing transfer and the final product generator (pipeline # 111); its header contains now such things as proposer's and target names.
Peakup data	SPITZER_S5_9876540_96_0_1_bcd.fits	FITS image as 2-D image with 32-bit real, 128x128 Size: 65536 bytes + header	Output of the engineering pipeline having been processed onboard the spacecraft, whose header is then modified by the pointing transfer and the final product generator (pipeline # 111); its header contains now such things as proposer's and target names.

* S0, S1, S2, S3 correspond to short-low (SL), short-high (SH), long-low (LL), long-high (LH)
S5, S6 correspond to peakup only blue (PB), peakup only red (PR)
In cycle 2, PU imaging will be introduced and we will have: S8, S9 correspond to peakup imaging blue (PBI), peakup imaging red (PRI)

IRS products that come out of the science pipeline:

File Type	Name SPITZER_S+module_aorkey_expnum_ dcenum_version_type.suffix or SPITZER_S+module_aorkey_dcenum_ version_Enum*_type.suffix	Format	Description
BCD	Earliest science archived pipeline product that is released (reduced 3D data cube): 1. SPITZER_S1_9876540_96_0_1_lnz.fits 1u. SPITZER_S1_9876540_96_0_1_lnzu.fits Data corrected for detector behavior ("droop" effect): 2. SPITZER_S1_9876540_96_0_1_droop.fits 2u. SPITZER_S1_9876540_96_0_1_drunc.fits Data with removed straylight/crosstalk, skipped in alternate path: 3. SPITZER_S1_9876540_96_0_1_rsc.fits 3u. SPITZER_S1_9876540_96_0_1_rscu.fits Fully processed data (including flat fielding): 4. SPITZER_S1_9876540_96_0_1_bcd.fits 4fu. SPITZER_S1_9876540_96_0_1_func.fits 4du. SPITZER_S1_9876540_96_0_1_dbunc.fits Alternate flat fielded data: 5. SPITZER_S1_9876540_96_0_1_f2ap.fits 5u. SPITZER_S1_9876540_96_0_1_f2unc.fits	1,1u. FITS image as 3-D cube with 32-bit real, 128x128xn (n depends on the Spectral Exp Time) Size: n x 65536 byte + header (typcial value: 1.0 Mbyte) 2,3,5. FITS image with 32-bit real, 128x128 Size: 100 kbyte 4. FITS image with 32-bit real, 128x128 Size: 80 kbyte 2u,3u,4u,5u. FITS image with 32-bit real, 128x128 Size: 70 kbyte	1. Product of the module "LINEARIZ" which linearizes the data according to a model for each pixel. 1u. Uncertainty file for lnz.fits 2. Most processing steps applied, except for straylight removal, cross talk correction, flat fielding, pointing transfer, and final product generator 2u. Uncertainty file for droop.fits 3. Most processing steps applied, except for flat fielding, pointing transfer, and final product generator 3u. Uncertainty file for rsc.fits 4. Collapsed (2-D) 128x128 slope image CORRECTED for straylight (SL) or crosstalk (SH,LH), after division by the flatfield image Obtained via ramp-slope estimation in the IRS pipeline 4fu. Uncertainty image for bcd.fits 4du. Uncertainty image associated with the product bcd.fits that comes from the darkcal pipeline 5. Data image UNCORRECTED for either crosstalk or straylight removal, after division by the flatfield image 5u. Uncertainty image for f2ap.fits
Coadded 2-D image	1. SPITZER_S1_9876540_96_1_E012345_coa2d.fits 2. SPITZER_S1_9876540_96_1_A012345_c2unc.fits 3. SPITZER_S1_9876540_96_1_A012345_inlst.txt 4. SPITZER_S1_9876540_96_1_A012345_2dcoad.txt	1. FITS image with 32-bit real, 128x128 Size: 90 kbyte 2. FITS image with 32-bit real, 128x128 Size: 70 kbyte 3-4. ASCII file Size: a few hundred byte	1. Image coadded according to selected criteria and rules 2. Uncertainty image for coa2d.fits 3. List of input files for coadding 4. Gives statistical weight of input files for coadding
Mask files	1. SPITZER_S1_9876540_96_0_1_bmask.fits 2. SPITZER_S1_9876540_96_0_1_dmask.fits 3. SPITZER_S1_9876540_96_1_A012345_c2msk.fits 4. SPITZER_S1_9876540_96_1_A012345_ibsmk.txt	1,3. FITS image with 16-bit integer, 128x128 Size: 40 kbyte 2. FITS image as 3-D cube with 16-bit integer, 128x128xn (n depends on the Spectral Exp Time) Size: n x 32768 byte + header (typical value: 530 kbyte) 4. ASCII file	1. Mask file, associated with bcd.fits, used to store pixel status information that is applicable to the individual collapsed (2-D) 128x128 slope image (see bit definition) 2. Mask file associated with lnz.fits, flags individual reads up the ramp 3. Mask file associated with the coa2d.fits, flags pixels with few valid inputs 4. List of bmask files
Log file	If associated with BCD product: SPITZER_S1_9876540_96_0_1_out.pline If associated with ensemble product: SPITZER_S1_9876540_96_1_A012345_out.pline	ASCII file Size: several 10 kbyte	Output log file from several pipelines

* The letter "E" stands for "ensemble" product and "A" for "ancillary ensemble" product. "Enum" is the ensemble number.

IRS products that come out of the extraction (post-BCD) pipeline:

File Type

Name
SPITZER_S+module_aorkey_expnum_ dcenum_version_type.suffix
or
SPITZER_S+module_aorkey_dcenum_ version_Enum*_type.suffix

Format

Description

Tuned spectrum table

Extracted spectrum:
1. SPITZER_S1_9876540_96_0_1_spect.tbl
Extracted position table for extracted spectrum:
1r. SPITZER_S1_9876540_96_0_1_ridge.tbl

Alternate extracted spectrum:
2. SPITZER_S1_9876540_96_0_1_spec2.tbl

Extracted spectrum from coadded data (coa2d.fits):
3. SPITZER_S1_9876540_96_1_E012345_tune.tbl
Extracted position table for coadded data:
3r. SPITZER_S1_9876540_96_1_A012345_ridge.tbl

1,2,3. ASCII table
Size: <= 200 kbyte

1r,3r. ASCII table
Size: <= 300 kbyte

1. Table containing flux in Jy as a function of wavelength for each order (BCD extraction)
1r. Table containing information about where the extraction was performed for extracted spectrum

2. Table containing flux in Jy as a function of wavelength for each order (alternate BCD extraction)

3. Table containing flux in Jy as a function of wavelength for each order (Extraction of coadd)
3r. Table containing information about where the extraction was performed for the coadded data

** The letter "E" stands for "ensemble" product and "A" for "ancillary ensemble" product. "Enum" is the ensemble number.

IRS calibration files:

File Type	Name b+module_type.suffix or b+module_r+rampduration**_type.suffix	Format	Description
Flat data cube	1. b0_flatfield.fits 2. b0_flatfield_cmask.fits	1. FITS image as 3-D cube with 32-bit real, 128x128x2 Size: 170 kbyte 2. FITS image with single-precision floating-point values, 128x128 Size: 90 kbyte	1. The first plane of data contains the flatfield image and the second plane of data contains the corresponding sigmas 2. Mask file associated with flatfield.fits
Dark data cube	1. b0_r6_dark.fits 2. b0_r6_dark_unc.fits 3. b0_r6_dark_cmask.fits	1,2. FITS image as 3-D cube with 32-bit real, 128x128xn (n depends on the Spectral Exp Time) Size: n x 65536 byte + header (typical value: 1.08 Mbyte) 3. FITS image as 3-D cube with 16-bit integer, 128x128xn (n depends on the Spectral Exp Time) Size: n x 32768 byte + header (typical value: 530 kbyte)	1. Dark calibration file: observation of a dark part of the sky 2. Uncertainty image associated with dark.fits 3. Mask file associated with dark.fits
Linearity data cube	1. b0_lincal.fits 2. b0_lincal_cmask.fits	1. FITS image as 3-D cube with 32-bit real, 128x128x3 Size: 200 kbyte 2. FITS image with 16-bit integer, 128x128 Size: 40 kbyte	1. Data cube describing the linearity coefficient for each pixel: The first plane contains the value of the linearity coefficient alpha (used in series expansion x+alpha*x^2); the second plane contains the "soft saturation cutoff" for the lincal module; the third plane contains the associated uncertainties of the first plane. 2. Mask file associated with lincal.fits
Flux	b0_fluxcon.tbl	ASCII file Size: < 6 kbyte	Flux conversion factors and order tuning coefficients. The photometric tuning coefficients are determined by polynomial fits (up to 5th order) to the ratios of extracted spectra of standard star observations and known spectral energy distributions (model).
Wavelength calibration tables	1. b0_wavsamp.tbl 2. b0_wavsamp_offset.fits 3. b0_wavsamp_wave.fits 4. b0_wavesamp_omask.fits	1. ASCII table Size: < 200 kbyte 2,3. FITS image with 32-bit real, 128x128 Size: 70 kbyte 4. FITS image with 16-bit integer, 128x128 Size: 40 kbyte	1. Table describing the pixel regions (can be fraction of a pixel) used in flatfielding and extraction. Each row describes the pixels contributing flux to a given wavelength in the output spectrum. 2. Spatial offsets (in arcseconds) per pixel from the FOV center 3. The wavelength associated with each pixel 4. The spectral order associated with each pixel
Other Mask files	1. b0_lmask.fits 2. b0_omask.fits 3. b0_pmask.fits 4. b0_umask.fits	1-4. FITS image with 16-bit integer, 128x128 Size: 40 kbyte	1. Mask identifying the unilluminated regions used in fitting the straylight correction in the short-low module 2. Order mask file 3. Mask file containing the long-term pixel status 4. Mask file identifying unilluminated regions for droop and dark corrections (different than lmask.fits for short-low)

* b0, b1, b2, b3 correspond to short-low (SL), short-high (SH), long-low (LL), long-high (LH)
** The ramp duration in seconds of:
   b0: 6,14,60,240
   b1: 6,30,120,480
   b2: 6,14,30,120
   b3: 6,14,60,240