  We present the results of a search for long-duration gravitational wave
transients in the data of the LIGO Hanford and LIGO Livingston second
generation detectors between September 2015 and January 2016, with a total
observational time of 49 days. The search targets gravitational wave transients
of \unit[10 -- 500]{s} duration in a frequency band of \unit[24 -- 2048]{Hz},
with minimal assumptions about the signal waveform, polarization, source
direction, or time of occurrence. No significant events were observed. %All
candidate triggers were consistent with the expected background, As a result we
set 90\% confidence upper limits on the rate of long-duration gravitational
wave transients for different types of gravitational wave signals. We also show
that the search is sensitive to sources in the Galaxy emitting at least $\sim$
\unit[$10^{-8}$]{$\mathrm{M_{\odot} c^2}$} in gravitational waves.
