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The NASA/GSFC network is currently experiencing intermittent issues that affect our services. We are working on it and apologize for the inconvenience.
The offline tool hark (also on github) can be used to find and download data from the cloud.

Okay, I have read this page but I still need HELP! Feedback or questions ?
Webspec Logo 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 :
9/25/25Updated XMM for AO25 (corrected 10/9/25).
6/24/25Updated AXIS for new baseline.

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.


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Okay, I have read this page but I still need HELP! Feedback or questions ?