I always enjoy this prize as it seems to be literary without being over-exclusive. There is no requirement that the book touch upon a certain theme. In fact, the only requirement is that the book be written in English within the calendar year. Even books in translation are up for the award as long as they were translated within that year, so both Sebald and Bolaño are recipients.
The National Book Critics Circle awards books in the following categories: Fiction, Nonfiction, Poetry, Biography, Autobiography, and Criticism.
Click here for a link to the NBCC official website.