This issue is a variant of Coup D'Etat: The Authority (DC, 2004 series) #1 [Whilce Portacio Cover].
Coup D'Etat was a company wide crossover event published by Wildstorm comics in 2004. The story ran across 4 issues, each featuring one of the major titles of the Wildstorm Universe at that time: Sleeper, Stormwatch: Team Achilles, Wildcats 3.0 and The Authority. It also included an Aftermath-issue including a preview to the second volume of Sleeper and a preview to the second volume of Wetworks.
This issue led into the events of The Authority: Revolution (Published by Wildstorm [Imprint of DC], 2004). The Authority created by Warren Ellis and Bryan Hitch.