Named on the 75th anniversary of the publication of the first IAU Circular, which was issued on 1922 Oct. 22 by the IAU Central Bureau for Astronomical Telegrams, then at the Copenhagen Observatory. The Bureau moved to the Smithsonian Astrophysical Observatory in 1965 and has now issued 6756 IAU Circulars, relating generally to transient astronomical objects and phenomena in urgent need of further observation. (M 30802) _ _.