X-ray Imaging Spectrometer (XIS)
Calibration

Calibration Products

Suzaku Data Analysis
From the Suzaku GOF, information about pipeline calibration processing and what to do with your data once you get it.

CALDB
The most recent calibration data are included in the Suzaku Calibration Database (CALDB) available from HEASARC. This includes static response files and parameter files for the response generator ftools (xisrmfgen and xissimarfgen).

Response files for AO2
RMF and ARF files based on ground calibration data, suitable for simulation and quick-look data analysis, although be aware that calibration is ongoing. Use the CALDB for the latest versions.

Check-Out Phase Results

Initial on-orbit results on gain, spectral resolution and noise:

• Gain (electrons/adu) from Mn Ka (assumed 1620 electrons) G02346: Tccd =-90C; Internal cal source spectra from 28 July 05, 5x5 mode

  Sensor/Segment    A        B        C        D
  XIS0              1.002    1.043    1.012    1.002
  XIS1(BI)          1.073    1.099    1.073    1.088
  XIS2              1.017    1.045    1.017    1.037
  XIS3              1.087    1.023    1.077    1.041
  

• Spectral Resolution at 5.9 keV (FWHM, eV) Tccd =-90C; Internal cal source spectra from 28 July 05, 5x5 mode Split threshold: 13 ADU

  Sensor/Segment    A        B        C        D
  XIS0              133.0    136.6    136.2    132.1
  XIS1(BI)          133.8    136.0    130.3    136.8
  XIS2              134.3    135.1    135.1    133.6
  XIS3              135.0    132.6    133.6    137.6
  

• Noise (from horizontal overclocks) in electrons, RMS (during quiet periods; may be up to 20% higher at some orbital phases) Tccd=-90C; frame mode data from 3 Aug 05

  Sensor/Segment    A        B        C        D
  XIS0              2.1      2.0      1.9      2.0
  XIS1(BI)          1.5      1.9      1.5      1.5
  XIS2              2.1      1.9      1.9      2.0
  XIS3              2.0      1.8      1.9      1.9
  

Some raw, "frame-mode" readouts from early XIS operations. The data show, clockwise from top left, readouts of XIS0 through XIS3. Cosmic ray tracks are obvious in the 3 front-illuminated sensors, but much less prominent in the the back-illuminated XIS1. These background events are largely excluded by on-board and ground data filtering. The single-pixel bright spots created by X-rays from the calibration source are also visible in all 4 detectors.

Last updated: Wed Feb 14 12:11:53 EST 2007 email: milleric@mit.edu