Expected upper limits, using the B (alternate) model : 
expected limit (median)
3.9030882394347155
expected limit (-1 sig)
2.3831285427639206
expected limit (+1 sig)
6.60821040613492
expected limit (-2 sig)
1.5816484281749423
expected limit (+2 sig)
10.76150610133882
 0 Signal events, 8 BKG
90.0%  upper limit
3.380722086639781