Neutron scattering study on CeAgAs2

► The magnetic ordering of CeAgAs2 was monitored by neutron data between 10 °K and 3.75 °K. ► CeAgAs2 orders antiferromagnetic below TN=6.2(1) K. ► Possible models of the antiferromagnetic structure are discussed. ► A metamagnetic transition by applying an external field was confirmed and found fully reversible.