The NH(a(1)Delta) + CO((XE+)-E-1) product channel for the photodissociation of HNCO at 201 nm was investigated using the sliced velocity map ion imaging technique with the detection of NH(a(1)Delta) products via (2 + 1) resonance enhanced multiphoton ionization (REMPI). Images were measured for the NH(a(1)Delta) rotational states in the ground and vibrational excited states (v = 0 and 1). Correlation between the NH(a(1)Delta) and CO rovibrational state distributions were determined from these images. Experimental results show that the vibrational distribution of the CO fragment in the NH(a(1)Delta) + CO(X-1 Sigma(+)) channel peaks at v = 1. The negative anisotropy parameter measured for the NH(a(1)Delta) (v = 0 and 1lj) products indicates a direct dissociation process for the N-C bond cleavage in the 5, state. A bimodal CO rotational distribution was observed, suggesting that HNCO dissociates in the S-1 state in two distinctive pathways.