The Rossi X-Ray Timing Explorer Project
Welcome to the Home Page for the All-Sky Monitor
(ASM) team at the Kavli
Institute for Astrophysics and Space Research at the Massachusetts Institute of
Here we provide information on, and data from, the ASM
(Levine et al. 1996)
aboard the Rossi X-ray Timing Explorer (RXTE;
Jahoda et al. 1996).
For more information, please contact
Dr. Alan Levine
All-Sky Monitor results
When you use ASM data products in a paper or talk, please include the
phrase: "results provided by the ASM/RXTE teams at MIT and at the RXTE SOF
and GOF at NASA's GSFC."
NOTICE (2008 January): A significant problem with a small number of
ASM source intensities in the light curve of a Galactic X-ray source
has recently come to our attention. Please see "Important Caveat" on
the ASM Light Curves
- The ASM Light Curves
page. If you are only interested in a particular source, you may
wish search for it instead.
See also the
ASM Data Products page at the
For security reasons, ftp is no longer allowed to this server.
Sftp and wget will also work.
- There is a running commentary on source
activity to supplement the ASM Light Curves page.
- The CrossBox page showcases events when two strong
detections of new source candidates yield overlapping error boxes in
the realtime analysis.
- The ASM: The
Movie page. We've animated our ASM data to show the dynamic
nature of the X-ray sky in Quick-Time movie format. Movies include
a full four-year version as well as selected highlights. More to come.
- Refereed publications using ASM data (ADS
search; may not be complete)
Other useful resources
Thank you for using our resources here at MIT.
The All-Sky Monitor