MIT CXC Documents

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 (320 K) or LaTeX source (30 K) of Rev. 2.11 (04/28/17)

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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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05/11/06

acis_make_bkgd spec

This document describes a specification for the ACIS tool acis_make_bkgd.

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04/28/17

acis_process_events spec

This document describes an incomplete specification for the ACIS tool acis_process_events.

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01/19/07

acis_process_events: bad-pixel spec

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

Download PDF, PS (68 K) or LaTeX source (4 K) of Rev. 1.0 (01/19/07)

10/01/02

acisreadcorr spec

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

Download PDF, PS (51 K) or LaTeX source (5 K) of Rev. 1.3b (10/01/02)

03/01/11

Afterglow detection efficiency

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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03/15/00

ACIS Analysis Reference Data Interface Control Document

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

Download PDF, PS (113 K) of Rev 2.1 (03/15/00)

Download PDF, PS (119 K) of Rev 2.0 (11/30/99)

Download PDF, PS (525 K) or LaTeX source of Rev 1.3 (03/12/99)

09/05/06

Bias header keywords

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

Download PDF, PS (61 K) or LateX source (2 K) of Rev. 1.0 (09/05/06)

11/14/13

Bias-parity errors

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 (248 K) or LateX source (18 K) of Rev. 1.3 (11/14/13)

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

Download PDF (288 K), PDF B/W (288 K), PS (240 K) or LateX source (18 K) of Rev. 1.0 (11/21/12)

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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05/25/11

Bias repair and replacement

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

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03/10/08

Check VFAINT background

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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10/27/10

CTI spec

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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02/19/13

DELTOCLK spec

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)

Download PDF (1338 K), B/W PDF (1338 K), PS (576 K) or LateX source (28 K) of Rev. 3.1 (02/19/13)

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

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07/20/13

Computation of ENERGY and PI

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)

03/18/14

Computation of FLTGRADE, GRADE, and PHA

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

Download PDF (86), B/W PDF (86 K), PS (192 K) or LateX source (14 K) of Rev. 1.7 (03/18/14)

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09/09/02

Computation of ONTIME, DTCOR, and EXPOSURE

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)

09/09/02

Computation of QUERY_VAL

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)

04/04/06

Computation of X, Y, and TIMEs of arrival of CC-mode events

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

Download PDF, PS (95 K) or LaTeX source (12 K) of Rev. 4.6 (04/04/06)

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

02/27/07

A caveat about FLTGRADE = 255 in Level 1 event files

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

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03/18/14

Grade ARD spec

This spec describes the grade ARD file structure.

Download PDF (78 K), B/W PDF (78 K), PS (200 K) or LaTeX source (15 K) of Rev 1.0 (03/18/14)

02/11/11

Hot-pixel spec

This document describes a specification for a hot-pixel detection algorithm. It is superseded by the newer acis_find_afterglow spec.

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10/23/00

ACIS Level 0 Interface Control Document

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

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09/11/00

ACIS Level 1 Interface Control Document

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

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06/08/05

Notes about ACIS instrument geometry data

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

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06/12/07

Mean biases

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)

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02/01/17

mkacisrmf

This document describes a specification for computing an ACIS RMF.

Download PDF (131 K), B/W PDF (131 K), PS (273 K) or LaTeX source (34 K) of Rev 1.00 (02/01/17)

07/10/02

ACIS pipeline processing caveats

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

HTML (07/10/02)

02/28/00

ACIS pipeline processing tools

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)

06/07/13

S4 streak algorithm

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)

08/15/13

S4 streak loss parameter

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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06/07/13

S4 streak properties

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

Download PDF (328 K) of the March 16, 2004 document (06/07/13)

04/28/17

STATUS bits in bad-pixel files

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

Download PDF (63), B/W PDF (63 K), PS (152 K) or LaTeX source (10 K) of Rev 1.12 (04/28/17)

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Download PDF, PS (67 K) or LaTeX source (10 K) of Rev 1.9 (08/29/05)

Download PDF, PS (67 K) or LaTeX source (9 K) of Rev 1.8 (08/23/05)

Download PDF, PS (65 K) or LaTeX source (7 K) of Rev 1.7 (05/20/05)

Download PDF, PS (69 K) or LaTeX source (7 K) of Rev 1.6 (12/15/04)

Download PDF, PS (69 K) or LaTeX source (7 K) of Rev 1.5 (10/27/04)

Download PDF, PS (70 K) or LaTeX source (7 K) of Rev 1.4 (10/15/04)

Download PDF, PS (69 K) or LaTeX source (7 K) of Rev 1.3 (06/30/04)

Download PDF, PS (69 K) or LaTeX source (6 K) of Rev 1.2 (06/28/04)

Download PDF, PS (50 K) or LaTeX source (6 K) of Rev 1.1 (09/25/02)

05/18/09

STATUS bits in event files

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

Download PDF (67 K), PS (74 K) or LaTeX source (12 K) of Rev 2.3 (05/18/09)

Download PDF, PS (73 K) or LaTeX source (12 K) of Rev 2.2 (01/19/07)

Download PDF, PS (71 K) or LaTeX source (11 K) of Rev 2.1 (04/24/06)

Download PDF, PS (71 K) or LaTeX source (11 K) of Rev 2.0 (04/06/06)

Download PDF, PS (71 K) or LaTeX source (9 K) of Rev 1.9 (03/29/06)

Download PDF, PS (70 K) or LaTeX source (8 K) of Rev 1.8 (11/17/05)

Download PDF, PS (51 K) or LaTeX source (8 K) of Rev 1.7 (03/05/03)

Download PDF, PS (51 K) or LaTeX source (8 K) of Rev 1.6 (10/18/02)

09/30/13

Sub-pixel event-repositioning and pixel randomization spec

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

Download PDF (128 K), B/W PDF (128 K), PS (272 K) or LaTeX source (20 K) of Rev 2.4 (09/30/13)

Download PDF (128 K), B/W PDF (128 K), PS (272 K) or LaTeX source (19 K) of Rev 2.3 (08/21/13)

Download PDF (128 K), B/W PDF (128 K), PS (264 K) or LaTeX source (20 K) of Rev 2.2 (06/28/13)

Download PDF (118 K), B/W PDF (118 K), PS (261 K) or LaTeX source (20 K) of Rev 2.1 (06/13/13)

Download PDF (128 K), B/W PDF (128 K), PS (264 K) or LaTeX source (20 K) of Rev 2.0 (01/11/13)

Download PDF (112 K), B/W PDF (112 K), PS (136 K) or LaTeX source (14 K) of Rev 1.2 (09/14/10)

Download PDF (112 K), B/W PDF (112 K), PS (136 K) or LaTeX source (14 K) of Rev 1.1 (09/07/10)

Download PDF (112 K), PS (136 K) or LaTeX source (14 K) of Rev 1.0 (05/19/10)

Download PDF (112 K), PS (136 K) or LaTeX source (15 K) of Rev 0.3 (05/14/10)

Download PDF (112 K), PS (128 K) or LaTeX source (13 K) of Rev 0.2 (05/13/10)

Download PDF (88 K), PS (108 K) or LaTeX source (10 K) of Rev 0.1 (05/11/10)

03/16/17

Temperature-dependent RMF spec

This document describes how a script could be used to create a temperature-dependent RMF.

Download PDF, (76 K) B/W PDF, (76 K) PS (216 K) or LaTeX source (8 K) of Rev 1.01 (03/16/17)

Download PDF, (73 K) B/W PDF, (73 K) PS (216 K) or LaTeX source (7 K) of Rev 1.00 (02/02/17)

04/06/03

Time-dependent gain ARD

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

Download PDF, PS (53 K) or LaTeX source (5 K) of Rev 1.0 (06/04/03)

06/02/06

Time-dependent gain spec

This document specifies how to apply the time-dependent gain adjustment. This spec is superseded by the acis_process_events spec.

Download PDF, PS (91 K) or LaTeX source (16 K) of Rev 1.6 (06/02/06)

Download PDF, PS (95 K) or LaTeX source (16 K) of Rev 1.5 (04/20/04)

Download PDF, PS (60 K) or LaTeX source (15 K) of Rev 1.4 (09/24/03)

Download PDF, PS (61 K) or LaTeX source (15 K) of Rev 1.3 (09/16/03)

Download PDF, PS (60 K) or LaTeX source (15 K) of Rev 1.2 (06/09/03)

11/15/04

New ACIS-S geometry file

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

Download PS (562 K) or LaTeX source (16 K) of Rev 1.0 (11/15/04)

Subject: HETG and LETG; HRC-S

2019.08.10

Pipeline enhancements to compute grating responses

This memo describes proposed pipeline changes for computation of grating responses (ARFs, RMFs) for the archive.

Current version: PDF Ver. 1.0 (10 Aug 2019)

2015.11.04

Grating/CC-mode enhancements

This memo describes changes made to acis_process_events and tg_resolve_events which improve order-sorting through a second pass of processing which uses the HETG-processing-determined CHIPY position to re-do CTI/gain/tgain corrections.

Current version: PDF Ver. 1.0 (04 Nov 2015)

2015.08.13

Tests/validation of new HRC-S QE and LETG EEFRAC

This memo shows test of the revised HRC-S QE and LETG EEFRAC (in the LSFPARM file). The LETGS effective area should be unchanged. EEFRAC changes were required for custom extractions which can improve a weak lines signal-to-noise ratio.

Current version: PDF Ver. 1.0 (11 August 2015)

2015.10.14

tgdetect2, tg_choose_method specifications

Current version: PDF TEX Ver. 0.2 (11 Sept 2012)

Overview PDF

2015.10.14

tg_findzo specifications

Current version: PDF TEX Ver. 1.0 (13 Dec 2012)

2013.06.24

HRC-S Tgain correction (for reduced background); LETG/HRC-S spectral filtering after HRC-S Tgain correction

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)

11/02/04

LETG+ACIS-S Spurious Rotation Issue

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

Download PS (331 K) or LaTeX source (12 K) of Ver. 1.0 (11/02/04)

2004.06.11

Technical Note: LETG/ACIS-S rotation compensation

Modification to extraction region to compensate for anomalous rotation residuals.

Download PS

03/23/06

Finding Zeroth Order Position

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

Download PS (238 K) or LaTeX source (77 K) of Ver. 1.4 (04/11/07)

03/27/99

Transmission Grating L1.5 to Archive Interface Control Document

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

Download PS LaTeX source Change-Orders.

Previous version: Download PS LaTeX source

05/28/99

Transmission Grating Level 2 to Archive Interface Control Document

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

Download PS LaTeX source Change-Orders.

Previous version: Download PS LaTeX source

06/04/99

Grating Tool Specifications: Level 1.5 LETG/HESF Region Mask Definitions and Wavelength Determination

Download PS (25 pages); Download LaTeX source.

04/22/99

Grating Tool Specifications: Level 1.5: ACIS Continuous-Clocking Mode Processing

Download PS (10 pages); Download LaTeX source.

2020 June 15

HETG/ACIS Focal Plane Temperature Analysis

Analysis of effects of high focal-plane temperature on HETGS effective area through QE and/or order-sorting.

WarmACISeffectsOnOSIP_20200611.pdf

Subject: PSF

12/28/01

ICD for the GRATING LSF LIBRARY

A detailed description of the LSF Library files.

download PS ..... (943 K)

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

10/07/98

PSF TOOL ICD

The PSF tool ICD.

download PS ..... (56 K)

download Latex Source ..... (3 K)

02/24/00

LSF LIBRARY and TOOLS TECHNICAL REFERENCE

The LSF Library and Tools Technical Reference.

download PS ..... (588 K)

HTML .....

12/28/01

LSF GUIDE

The LSF Guide.

download PS ..... (437 K)

HTML .....

06/10/04

Data Randomization / New Header Keywords

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)

Download PS (53 K) or LaTeX source (6 K) of Rev 0.3 (03/03/04)

Download PS (53 K) or LaTeX source (6 K) of Rev 0.4 (03/15/04)

Download PS (53 K) or LaTeX source (6 K) of Rev 1.0 (06/10/04)

05/03/04

LSFPARM for HETG+ACIS-S validated for unrandomized datasets

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

Download PS (376 K) or LaTeX source (39 K) of Ver. 1.0 (04/26/04)

Download PS (372 K) or LaTeX source (40 K) of Ver. 1.1 (05/03/04)

05/03/04

LSFPARM for LETG+HRC-S validated for unrandomized datasets

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

Download PS (287 K) or LaTeX source (9 K) of Ver. 1.0 (05/03/04)

07/20/04

LSFPARM for LETG+ACIS-S validated for unrandomized datasets

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

Download PS (181 K) or LaTeX source (26 K) of Ver. 1.0 (07/20/04)

01/22/07

Updated LSFPARM for MEG+ACIS-S for unrandomized datasets

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

Download PS (185 K) or LaTeX source (20 K) of Ver. 1.0 (01/22/06)

Subject: Analysis Reference Data

3/26/99

Exposure Maps and Gratings Data Level 1.5 and 2.0 Analysis Reference Data ICD

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

Download PS (about 80 pages) or LaTeX source or LaTeX template for new files.
Change-Orders.

ACIS Spatial Contamination (2004.10.13 UPDATE)

ACIS Dead Area (2006.09.14 update)

04/21/98

Spectroscopy Database: Analysis Reference Data ICD

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

Download PS .... (511K)

Download LaTeX source .... (40K ARD_template)

Subject: ISIS

1/8/99

ISIS: Interactive Spectral Interpretation System

Download PS ..... (392 K)

Subject: Exposure Map

	2/09/99	Exposure Map Data Products ICD Download PDF, PS, or LaTeX source
	2/08/99	Aspect Histogram Processing and Data Products ICD Download PDF, PS, or LaTeX source (About 14 pages/1 MB de-compressed)
	09/11/2000	Introduction to Exposure Maps Download PDF or PS (12 pages, about 1 Mb uncompressed)

Subject: Miscellaneous

An Introduction to S-Lang

Talk by John E. Davis, from CXC S-Lang class (January, 2003)
(pdf)

Advanced S-Lang Applications

Talk by John C. Houck, from CXC S-Lang class (January, 2003)
(pdf) (ps)

Examples of S-Lang in Data Analysis

Notes by David Huenemoerder from CXC S-Lang classes (January, 2003)
(ps) (pdf)
The Slides (a less detailed version of the Notes):
(ps) (pdf)

12/13/2001

CIAO 3 Interactive Analysis Planning

Architecture design for interactive analysis and rapid prototyping.
Download PS   .....
Download Part 2 (summary for discussion, some Slang examples)   .....

04/02/97

AXAF Transmission Grating Diffraction Coordinates

Describes the transformation from reported event positions
to dispersion coordinates.
Download PS   ..... (101 K)

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Last Updated: April 28, 2017 by GEA