In this work, we report on observations with the Neutron Star Interior
Composition Explorer of the known neutron star X-ray transient XTE
J1739–285. We observed the source in 2020 February and March, finding it
in a highly active bursting state. Across a 20 day period, we detected
32 thermonuclear X-ray bursts, with an average burst recurrence time of .
A timing and spectral analysis of the ensemble of X-ray bursts reveals
homogeneous burst properties, evidence for short-recurrence time bursts,
and the detection of a 386.5 Hz burst oscillation candidate. The latter
is especially notable, given that a previous study of this source
claimed a 1122 Hz burst oscillation candidate. We did not find any
evidence of variability near 1122 Hz and instead find that the 386.5 Hz
oscillation is the more prominent signal of the two burst oscillation
candidates. Hence, we conclude it is unlikely that XTE J1739–285 has a
submillisecond rotation period.