Launch postponed until July 13, 2019

The state commission that oversees the launch of Proton-M carrier rocket with DM-03 booster and Spektr-RG satellite telescope decided to postpone the launch of the Spektr-RG observatory to July 13, 2019 due to issues with rocket subsystem.

Final decision about a possibility of the launch will be provided by the state commission at morning of July 13, 2019.

Source (russian) at Roscosmos official site