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News Previous Items

07 Nov 2006 [New]

CALDB version 3.2.4 has been released. This release contains ACIS time-dependent gain calibration files only. See the How CALDB 3.2.4 Affects Your Analysis section of the CIAO release notes and the CALDB release notes for details.

Download CALDB 3.2.4

31 Jul 2006

New webpage: Effective Area Cross-calibration Results Involving the Chandra X-ray Observatory

This webpage provides a discussion of cross-calibration work relating the Chandra X-ray Observatory to other X-ray missions, particularly XMM-Newton. Much of this webpage was developed in cooperation with the XMM-Newton calibration team.

Data Preparation

WHAT'S NEW | WATCH OUT

| Top | All | Intro | Data Prep | Timing | Imag | Imag Spec | Grating | S-Lang | Datasets || Proposal | ChaRT | Sherpa |

When Chandra data goes through Standard Data Processing (SDP), the most recently available calibration is applied to it. Since this calibration is continuously being improved, one should check whether there are currently newer files available. Similarly, some science decisions are made during SDP; every user has the option to reprocess the data with different parameters.

See the current Calibration Status Report
Analysis Guides:
- ACIS Data Preparation
- HRC Data Preparation
General:
- Use Observation-specific Bad Pixel Files
  Uses: the acis_set_ardlib script
- Filtering Data
- Filtering Lightcurves
  Uses: the analyze_ltcrv.sl S-Lang script
- Create a New Level=2 Event File
Coordinates, Astrometry, & Spatial Filtering:
ACIS:
- Check the ACIS Data Caveats
- Why topic: Continuous Clocking Mode
- Calculate CC-mode Times of Arrival
  (25 Apr 2006)
- acis_process_events:
  - The Create a New Level=2 Event File thread simplifies reprocessing data by combining all the acis_process_events options into one run of the tool.
  - Apply the Time-Dependent ACIS Gain Correction
    (7 Nov 2006)
  - Apply the ACIS CTI Correction
  - Apply an ACIS Gain Map
  - Remove ACIS Pixel Randomization
  - Apply/Remove ACIS PHA Randomization
  - Clean ACIS Background in VFAINT Mode
- Remove the acis_detect_afterglow Correction
- Identify ACIS Hot Pixels and Cosmic Ray Afterglows
- Using the ACIS "Blank-Sky" Background Files
  Uses: the acis_bkgrnd_lookup script; the lc_clean.sl S-Lang script
- Destreak the ACIS-S4 Chip
- Remove the ACIS Readout Streak
HRC:
ACA Monitor Window Data:
- Processing ACA Monitor Window Data

Hardcopy (PDF): A4 | Letter

Last modified: 19 July 2006

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