  For over 15 years the Fermi Large Area Telescope (Fermi-LAT) has been
monitoring the entire high-energy gamma-ray sky, providing the best sampled 0.1
-- $>1$ TeV photons to this day. As a result, the Fermi-LAT has been serving
the time-domain and multi-messenger community as the main source of gamma-ray
activity alerts. All of this makes the Fermi-LAT a key instrument towards
understanding the underlying physics behind the most extreme objects in the
universe. However, generating mission-long LAT light curves can be very
computationally expensive. The Fermi-LAT light curve repository (LCR) tackles
this issue. The LCR is a public library of gamma-ray light curves for 1525
Fermi-LAT sources deemed variable in the 4FGL-DR2 catalog. The repository
consists of light curves on timescales of days, weeks, and months, generated
through a full-likelihood unbinned analysis of the source and surrounding
region, providing flux and photon index measurements for each time interval.
Hosted at NASA's FSSC, the library provides users with access to this
continually updated light curve data, further serving as a resource to the
time-domain and multi-messenger communities.
