This document describes a specification for the ACIS tool acis_build_chip_gti.

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This document describes a specification for the ACIS tool acis_build_mask.

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This document describes a specification for the ACIS tool acis_detect_hotpix. This algorithm has been superseded by newer afterglow and hot pixel specs.

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This document describes a specification for an algorithm to find afterglows on ACIS CCDs. The algorithm supersedes the previous afterglow and hot pixel-detection algorithm.

Download PDF (114 K), PS (132 K) or LaTeX source (18 K) of Rev. 1.8 (08/13/08)

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This document describes a specification for the ACIS tool acis_make_bkgd.

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This document describes a specification for the use of bad-pixel files by the ACIS tool acis_process_events.

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This document describes a specification for the computation of TIME for the ACIS tool acisreadcorr.

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This document describes the use of the parameters bitflag and usrfile for the tool acis_build_badpix.

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This document describes the formats of the Analysis Reference Data files used by the ACIS tools.

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This spec describes how to determine the values of some of the keywords in the header of an ACIS bias file.

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This spec describes how to determine the values of some of the keywords in the header of an ACIS bias file.

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This spec describes how to replace one bias with another.

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This document describes an algorithm that can be used to search for potential cosmic-ray background events in the data for TIMED VFAINT mode obsevations.

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This document describes how to compute the CTI-adjusted values of PHAS, PHA, ENERGY, PI, FLTGRADE, and GRADE for ACIS event data.

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This document describes how to compute FLTGRADE, GRADE, and PHA for ACIS event data.

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Download PS (280 K) of Rev. 1.1 (04/02/99)

This document describes how to compute TIMEDEL, FLSHTIME, ONTIME, DTCOR, and EXPOSURE for ACIS event data.

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This document describes how to compute QUERY_VAL for ACIS housekeeping data.

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This document describes how to compute the sky coordinates and times of arrival of photons at the detector for CC-mode event data.

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Download PS (1.7 M) file of Chandra Calibration Workshop presentation, November 2002 (11/07/02)

This document describes why Level 1 event files can contain events that have FLTGRADE = 255.

Download PDF, PS (66 K) or LaTeX source of Rev 1.0 (02/27/07)

This document describes a specification for a hot pixel-detection algorithm. It supersedes the previous afterglow and hot pixel-detection algorithm.

Download PDF (98 K), PS (120 K) or LaTeX source (12 K) of Rev. 2.1 (07/30/08)

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This document describes the formats of the Level 0 data products.

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Download older revisions of the ICD

This document describes the formats of the Level 1 data products.

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Download PDF, PS (56 K) or Framemaker source of Rev 1.10 (08/05/99)

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Download older revisions of the ICD

This document describes some self-consistency tests of the LSI coordinates of the ACIS CCDs.

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This document describes a specification for computing observation-specific biases from mean biases.

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This document describes caveats about ACIS pipeline-produced event data.

HTML (07/10/02)

This document describes the ACIS pipeline processing tools.

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This document describes the conditions for which the STATUS bits in ACIS bad pixel files are set.

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This document describes the conditions for which the STATUS bits in ACIS event data files are set.

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This document describes the format of the ARD file used to compute the time-dependent gain adjustment.

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This document specifies how to apply the time-dependent gain adjustment.

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This document specifies the update on ACIS-S CCD chip corner positions and MEG grating period.

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This document describes the LETG+HRC-S time-dependent linearized PI computation ("SPI") and event filter for background reduction.

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Previous version: PDF Ver. 1.3 (8 July 2009)

This document describes the LETG+ACIS-S spurious rotation issue.

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Modification to extraction region to compensate for anomalous rotation residuals.

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This document describes a new algorithm of detecting zeroth order position.

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A detailed description of Grating L1.5 (event diffraction coordinates) data products.

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A description of Grating Level 2 data products (binned spectrum).

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A detailed description of the LSF Library files.  

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The PSF tool ICD.  

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The LSF Library and Tools Technical Reference.  

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The LSF Guide.  

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This document describes how we propose to implement additional FITS keywords into Level 1 Event products and higher.

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This document describes the quality of new non-randomized LSFPARM products for HETG+ACIS-S configuration.

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This document describes the quality of new non-randomized LSFPARM products for LETG+HRC-S configuration.

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This document describes the quality of new non-randomized LSFPARM products for LETG+ACIS-S configuration.

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This document describes the quality of new non-randomized LSFPARM products for MEG+ACIS-S configuration.

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Interface Control Document describing the reference data read by exposure map and gratings pipelines and tools.

ACIS Spatial Contamination pages (2004.10.13 UPDATE)

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The format of the Spectroscopy Database files to be used in L2 spectral analysis is described here.

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