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 This spec is superseded by the newer afterglow and hot-pixel detection spec.

Download PDF, PS (115 K) or LaTeX source (23 K) of Rev. 1.11 (06/16/06)

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This document describes the afterglow detection efficiency of acis_run_hotpix.

Download PDF (224 K), PS (136 K) or LaTeX source (20 K) of Rev. 1.2 (03/01/11)

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This document describes a specification for algorithms to find afterglows and hot pixels on ACIS CCDs. This spec supersedes the previous acis_detect_hotpix and hot-pixel detection specs.

Download PDF (152 K), B/W PDF (152 K), PS (312 K) or LaTeX source (30 K) of Rev. 2.10 (4/11/12)

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Download PDF (128 K), B/W PDF (128 K), PS (160 K) or LaTeX source (19 K) of Rev. 1.9 (08/16/10)

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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 handle bias-parity errors when producing a bad-pixel file.

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Download PDF (288 K), PDF B/W (288 K), PS (240 K) or LateX source (18 K) of Rev. 0.4 (11/19/12)

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This spec describes how to repair or replace a bias for an observation with a suitable bias from another observation.

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Download PDF (56 K), PS (69 K), or LaTeX source (3 K) of Rev 1.0 (08/12/09)

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

Download PDF (79 K), PS (157 K) or LateX source (5 K) of Rev. 1.4 (03/10/08)

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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. The algorithm includes a temperature-dependent scaling factor for the integrated trap-density maps.

Download PDF (152 K), B/W PDF (152 K), PS (176 K) or LateX source (34 K) of Rev. 7.2 (10/27/10)

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Download PDF (144 K), PS (152 K) or LateX source (38 K) of Rev. 6.2 (09/01/09)

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Download PDF, PS (71 K) or LateX source (26 K) of Rev. 4.7b (09/09/02)

This document describes the algorithm used to identify anomalous DELTOCLK values.

Download PDF (1338 K), B/W PDF (1338 K), PS (576 K) or LateX source (28 K) of Rev. 3.2 (02/19/13)

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Download PDF (1342 K), B/W PDF (1342 K), PS (586 K) or LateX source (28 K) of Rev. 3.0 (02/19/13)

Download PDF (496 K), PS (304 K) or LateX source (22 K) of Rev. 2.0 (04/30/12)

Download PDF (491 K), B/W PDF (491 K), PS (312 K) or LateX source (14 K) of Rev. 1.4 (03/13/12)

Download PDF (488 K), B/W PDF (488 K), PS (216 K) or LateX source (14 K) of Rev. 1.3 (06/18/11)

Download PDF (152 K), B/W PDF (152 K), PS (144 K) or LateX source (13 K) of Rev. 1.2 (06/15/11)

Download PDF (76 K), B/W PDF (76 K), PS (112 K) or LateX source (8 K) of Rev. 1.1 (06/10/11)

Download PDF (60 K), PS (86 K) or LateX source (4 K) of Rev. 1.0 (06/03/11)

This document describes how to compute ENERGY and PI for ACIS event data.

Download PDF (176 K), B/W PDF (176 K), PS (200 K) or LateX source (200 K) of Rev. 1.0 (07/20/13)

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

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Download PDF, PS (64 K) or LateX source (7 K) of Rev. 1.4 (05/16/03)

Download PDF, PS (64 K) or LateX source (7 K) of Rev. 1.3b (09/09/02)

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.

Download PDF, PS (66 K) or LaTeX source (11 K) of Rev. 1.2b (09/09/02)

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

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Download PDF, PS (59 K) or LaTeX source (13 K) of Rev. 1.0 (08/26/02)

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 older acis_detect_hotpix spec and is superseded by the newer afterglow and hot-pixel detection spec.

Download PDF (112 K), PS (144 K) or LaTeX source (12 K) of Rev. 2.3 (01/23/11)

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

Download PDF, PS (124 K) or Framemaker source of Rev 3.2 (10/23/00)

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Download PDF or PS (115 K) of Rev 2.11 (06/08/99)

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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 (57 K) of Rev 2.0 (11/05/99)

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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.

Download PDF (59 K), PS (75 K) or LaTeX source (3 K) of Rev 1.2 (06/12/07)

Download PDF (52 K), PS (66 K) or LaTeX source (2 K) of Rev 1.1 (06/04/07)

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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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Download PDF or PS (89 K) of Rev 2.0 (11/01/99)

This document describes an algorithm used to identify horizontal, instrumental, streak events on ACIS-S4.

Download PDF (1574 K) of the August 1, 2000 document (06/07/13)

This document describes a better implementation of the fractional loss parameter of the tool that identifies horizontal, instrumental, streak events on ACIS-S4.

Download PDF (1933 K) or Source files (288 K) of Rev. 2.0 (08/15/13)

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This document describes the properties of the horizontal, instrumental, streak events on ACIS-S4.

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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 is a spec describing the sub-pixel event-repositioning and pixel randomization algorithms.

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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 HRC-S time-dependent linearized PI computation ("SPI") for background reduction and associated CALDB "t_gmap" file (appropriate for all HRC-S observations), and the associated HRC-S/LETG event filter required for spectral extraction from Tgain-corrected HRC-S events (CALDB "pireg_tgain" file).

Current version: PDF Ver. 1.4 (24 November 2009)

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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.

Download PS   LaTeX source    Change-Orders.

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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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download Latex Source   .....  (23 K) 

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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