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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Download PDF, PS (60 K) or LaTeX source (14 K) of Rev. 3.2 (12/04/02)

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 This spec is superseded by the newer afterglow and hot-pixel detection spec.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

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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.

Download PDF (288 K), PDF B/W (288 K), PS (240 K) or LateX source (18 K) of Rev. 1.1 (10/21/13)

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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.

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

Download PDF, PS (59 K) or LaTeX source (13 K) of Rev. 1.1 (09/09/02)

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 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.

Download PDF (59), PS (73 K) or LaTeX source (10 K) of Rev 1.11 (06/19/07)

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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)

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.

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.

Download PS (53 K) or LaTeX source (6 K) of Rev 0.2 (03/01/04)

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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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Change-Orders.

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

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