We present an optical , X-ray , and \gamma -ray study of 1SXPS J042749.2-670434 , an eclipsing X-ray binary which has an associated \gamma -ray counterpart , 4FGL J0427.8-6704 .
This association has led to the source being classified as a transitional millisecond pulsar ( tMSP ) in an accreting state .
We analyse 10.5 years of Fermi LAT data , and detect a \gamma -ray eclipse at the same phase as optical and X-ray eclipses at the > 5 \sigma level , a significant improvement on the 2.8 \sigma level of the previous detection .
The confirmation of this eclipse solidifies the association between the X-ray source and the \gamma -ray source , strengthening the tMSP classification .
However , analysis of several optical data sets and an X-ray observation do not reveal a change in the source ’ s median brightness over long timescales or a bi-modality on short timescales .
Instead , the light curve is dominated by flickering which has a correlation time of 2.6 min alongside a potential quasi-periodic oscillation at \sim 21 min .
The mass of the primary and secondary star are constrained to be M _ { 1 } = 1.43 ^ { +0.33 } _ { -0.19 } M _ { \odot } and M _ { 2 } = 0.3 ^ { +0.17 } _ { -0.12 } M _ { \odot } through modelling of the optical light curve .
While this is still consistent with a white dwarf primary , we favour the transitional millisecond pulsar in a low accretion state classification due to the significance of the \gamma -ray eclipse detection .