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 Technology. 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 page.

  • 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 RXTE GOF 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 information

Other useful resources

Thank you for using our resources here at MIT.

The All-Sky Monitor

28th July 2004