  We consider the problem of (almost) lossless source coding of two correlated
memoryless sources using separate encoders and a joint decoder, that is,
Slepian-Wolf (S-W) coding. In our setting, the encoding and decoding are
asynchronous, i.e., there is a certain relative delay between the two sources.
Neither the source parameters nor the relative delay are known to the encoders
and the decoder. Since we assume that both encoders implement standard random
binning, which does not require such knowledge anyway, the focus of this work
is on the decoder. Our main contribution is in proposing a universal decoder,
that independent of the unknown source parameters and the relative delay, and
at the same time, is asymptotically as good as the optimal maximum a posteriori
probability (MAP) decoder in the sense of the random coding error exponent
achieved.Consequently, the achievable rate region is also the same as if the
source parameters and the delay were known to the decoder.
