On Saturday, July 27, from 11:00 to 21:00 UTC (7 am to 5 pm US Eastern Time), all MAST services will be unavailable due to maintenance.
Acknowledgments
MAST made extensive use of the XMM-Newton web sites at HEASARC and VILSPA.
All the catalog information and data sets available from MAST were provided
by the HEASARC Guest Observer Facility.