Ignace J. Gelb et al. discuss Assyrian bussurtu as meaning "unexpected tidings (usually good)."
"bussurtu," in The Assyrian Dictionary of the Oriental Institute of the University of Chicago, ed. Ignace J. Gelb, Benno Landsberger, A. Leo Oppenheim, and Erica Reiner, 21 vols. (Chicago: The Oriental Institute, 1965), 2:346
bussurtu (passurtu, basratu) s.; unexpected tidings (usually good); . . . ūmu ubla bu-su-ra-tu-ma (what) the day brought me (is) only good news (incipit of a song) KAR 158 r. ii 15; note ṭuppi-bu-us-su-rat ḫadê [u su]lummê tušēbila a[na] ma[ḫa]r [ilū]tija (I, Aššur, will deliver your enemies into your hand and) you will send a tablet with the good news and news of peace to My Majesty (referring to the reports of the NA) kings to the god)