WebSpec Home Page

Okay, I have read this page but I still need HELP!

WebSpec is a web interface for the X-ray spectral fitting package, XSPEC. It simulates spectral data for a variety of X-ray missions/instruments. WebSpec can not be used to analyze real data. This page is for the simple interface. More experienced XSPEC users, may want to use an advanced interface which allows up to 9 components. Latest news :

12/20/16	Chandra updated for Cycle 19.
9/12/16	XMM updated for AO16.

Choose a Mission/Instrument

Specify the desired model expression by clicking on a model in each of the scroll boxes and indicating via the checkbox whether you want pileup and/or photoelectric absorption. If you only want one model then click on the top blank line in the second scroll box. When you are ready click the button to set model parameters. To start again click the reset button.

Pile-up (Chandra only).

Photoelectric Absorption.

X (

Available Models

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Okay, I have read this page but I still need HELP!

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A service of the Astrophysics Science Division at NASA/GSFC and the High Energy Astrophysics Division of the Smithsonian Astrophysical Observatory (SAO)

HEASARC Director: Dr. Alan P. Smale
HEASARC Associate Director: Dr. Roger Brissenden
NASA Official: Phil Newman
Web Curator: J.D. Myers
Last Modified: 20-Dec-2016

National Aeronautics and Space Administration

Goddard Space Flight Center

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