PIMMS Version s2.1a Release Note

This version contains these new features and updates:

  • A new version of the XTE PCA effective area curve (see below for details).
  • The HEAO-1 A4 LED effective area is now available, giving the ability to predict count rates in the 4 bands used by Levine et al (1984, ApJS 54, 581).
  • The Spectrum-X-Gamma SODART (with LEPC, HEPC, and SIXA) effective area is now included.
  • The SAX (with LECS, MECS, HPGSPC, PDS and WFC) effective area is now included.
  • A number of miscellaneous bug fixes have been implemented.

The new XTE PCA effective area curve brings count rate estimates using PIMMS and the 256 channel and 6 channel PCA matrices (used in XSPEC) into agreement. Earlier versions of PIMMS used a slightly larger, but not unreasonable, PCA effective area and used a response matrix having an energy scale and offset different from the 6 channel matrix. The effect is that the total count rate was larger than that obtained using the 6 channel PCA matrix (5det_6ch.rmf) by a factor of 1.143, and that counts in the lowest canonical channel were underestimated.


HEASARC Home | Observatories | Archive | Calibration | Software | Tools | Students/Teachers/Public

The HEASARC welcomes your participation in a brief survey to capture how users access and utilize HEASARC data, software, and services. The outcome(s) of this survey will be used to guide, prioritize, and plan our activities and development in the coming years. It contains 18 questions, generally takes just a few minutes to complete, and your answers will remain totally anonymous. We thank you in advance for your valuable feedback.

This file was last modified on Tuesday, 13-Sep-2005 16:04:36 EDT