Revised on March, 3, 2025

Since 2008 over 1,500 blazars have been monitored on a ~3-day cadence at 15 GHz. Caltech thanks the hundreds of astronomers worldwide who have contacted us leading to an average of over one paper per month in refereed journals using 40 m Telescope data since 2008.

The number of requests for OVRO 40 m data has increased to the point where it is unmanageable with our current resources. Thus, we no longer maintain the program as a community service.

We will continue to support our ongoing collaborations to the best of our ability, but we no longer provide 40 m data to the community at large.

Data Usage Policy

We kindly ask you to adhere to the following points:

• Invite the OVRO 40m team as co-authors to any publication using these data and allow us to contribute to the analysis and interpretation from an early stage on.
• Cite Richards et al., 2011 for the observations and data reduction.
• Add the following acknowledgments:

"This research has made use of data from the OVRO 40-m monitoring program (Richards, J. L. et al. 2011, ApJS, 194, 29). This monitoring program has been supported by NSF grants AST-0808050 and AST-1109911, and is currently supported by NSF grant AST-2407603 and AST-2407604. It has also been supported by NASA grants NNX08AW31G, NNX11A043G, and NNX14AQ89G."

• Light curves (data or plots) are not to be further distributed, published, or made public without our explicit consent.

Violations of our Data Usage Policy:

Unfortunately, we have learned of several violations of our former Data Usage Policy in which people have downloaded data for a single source without informing us, downloaded data on multiple objects without prior permission, and/or neglected to include acknowledgments to our sponsors.

If you have used OVRO 40 m Telescope data for any purpose, including both studies of radio light curves and publication of results derived from the light curves, without prior permission, please contact Philipe Vergara de la Parra as soon as possible to discuss how to comply with our Data Usage Policy.

If you have any questions about the intellectual property policies of California Institute of Technology, please contact our Office of the General Counsel.