  We present the results of 45 transit observations obtained for the transiting
exoplanet HAT-P-32b. The transits have been observed using several telescopes
mainly throughout the YETI network. In 25 cases, complete transit light curves
with a timing precision better than $1.4\:$min have been obtained. These light
curves have been used to refine the system properties, namely inclination $i$,
planet-to-star radius ratio $R_\textrm{p}/R_\textrm{s}$, and the ratio between
the semimajor axis and the stellar radius $a/R_\textrm{s}$. First analyses by
Hartman et al. (2011) suggest the existence of a second planet in the system,
thus we tried to find an additional body using the transit timing variation
(TTV) technique. Taking also literature data points into account, we can
explain all mid-transit times by refining the linear ephemeris by 21ms. Thus we
can exclude TTV amplitudes of more than $\sim1.5$min.
