For those of you who have enjoyed reading Celan, please do read the recently published correspondence between Celan and Ingeborg Bachmann in Correspondences translated by Wieland Hoban, and published by Seagull Press in Europe and University of Chicago Press in the US.
If you haven't read Bachmann there are several translations of her poems. Songs in Flight, trans. Peter Filkins is a good place to start. Also in German, a stunning collection of Bachmann's unpublished poems and fragments (published in 2000) called Ich weisz keinne bessere Welt/I know of no better World). .