  We present the characterization of the transiting planet KELT-1b % ($R_p
\simeq 1.15 R_J, M_p \simeq 27.23 M_J $) using data from the Transiting
Exoplanet Survey Satellite (TESS). % during cycle $2$ and sector $17$. Our
light curve model includes primary transit and secondary eclipse. Here, we
model the systematic noise using Gaussian processes (GPs) and fit it to the
data using the Markov Chain Monte Carlo (MCMC) method. Modelling of the TESS
light curve returns a planet-to-star radius ratio, $p =$
$0.07652_{-0.00028}^{+0.00029}$ and a relatively large secondary eclipse depth
of $388_{-13}^{+12}$ ppm. The transit ephemeris of KELT-1b is updated using the
MCMC method. Finally, we complement our work by searching for transit timing
variations (TTVs) for KELT-1b. We do not find significant variations from the
constant-period models in our transit time data.
