# THE ROSAT PSPC RESPONSE MATRICES

### 256 PI channel detector redistribution matrices

**Stored on the ftp server are under https://heasarc.gsfc.nasa.gov/FTP/caldb/data/rosat/pspc/cpf/matrices/**

The following matrices are 2-dimensional arrays (energy vs. channel)
containing the probabilities that a photon of a given incident energy which
enters the detector will give rise to an event in a given PI channel.
As such they are VALID FOR ALL REGIONS of the detector, but also require
an appropriately constructed "Ancillary Response File" (ARF) to enable
spectral analysis to be performed in XSPEC.
(ARFs can be constructed using the FTOOLS task **ftools/rosat/pcarf**)

**pspcb_gain1_256.rmf**- - valid for PSPCB data taken BEFORE 1991 Oct 14
**pspcb_gain2_256.rmf**- - valid for PSPCB data taken AFTER 1991 Oct 14
**pspcc_gain1_256.rmf**- - valid for ALL PSPCC data (detector destroyed on 1991 Jan 25)

**On-axis 256 PI channel response matrices (including the on-axis effective areas)**The following matrices are 2-dimensional arrays (energy vs channel) containing the above detector redistribution (probability) matrices BUT MULTIPLIED by the XRT effective area, window transmission etc appropriate for ON-AXIS sources.

**pspcb_gain1_256.rsp**- - valid for PSPCB data taken BEFORE 1991 Oct 14 (formerly known as pspcb_92mar11.rmf)
**pspcb_gain2_256.rsp**- - valid for PSPCB data taken AFTER 1991 Oct 14 (formerly known as pspcb_93jan12.rmf)
**pspcc_gain1_256.rsp**- - valid for ALL PSPCC data (detector destroyed on 1991 Jan 25) (formerly known as pspcc_92mar11.rmf)

**Old-style on-axis response matrices (including the on-axis effective areas)**
A limited number of old-style (binary SF) matrices are available within the
'**old**' subdirectory. Further information can be obtained from the README file
in that directory, but the use of these matrices is STRONGLY DISCOURAGED in
favour of the FITS matrices listed above.

Curator:

HEASARC Guest Observer Facility

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