With the text "Alleluia Surrexit Christus," &c., and the necessary variations in the neumes, it is on p. 254 of the 1961 GR. The Global Chant Database shows what I take to be the same melody, set with your text, "Laudate Dominum," in several earlier sources, including the Graduale Sarisburiense.
The Ordo Cantus Missae gives "D 4" as the source of this Alleluia. This should refer to K.H. Schlager, Thematischer Katalog der ältesten Alleluia-Melodien aus Handschriften des 10. und 11. Jahrhunderts ausgennomen das ambrosianische, alt-römische und alt-spanische Repertoire, München, 1965 [Erlanger Arbeiten zur Musikwissenschaft, 2]
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