Enabling discovery of gravitationally lensed explosive transients: a new
  method to build an all-sky watch-list of groups and clusters of galaxies
  Cross-referencing a watchlist of galaxy groups and clusters with transient
detections from real-time streams of wide-field survey data is a promising
method for discovering gravitationally lensed explosive transients including
supernovae, kilonovae, gravitational waves and gamma-ray bursts in the next ten
years. However, currently there exists no catalogue of lenses with both
sufficient angular extent and depth to adequately perform such a search. In
this study, we develop a method capable of creating an all-sky list of galaxy
group- and cluster-scale objects out to $z\simeq1$ based on their lens-plane
properties and using only existing data from wide-field infrared surveys.
Importantly, the data exists ready to implement our methods in advance of when
the Vera Rubin Observatory's (Rubin's) Legacy Survey of Space and Time (LSST)
commences survey operations. In testing this method, we recover 91 per cent of
a sample containing known and candidate lensing objects with Einstein radii of
$\theta_E \geq 5\arcsec$. We also search the surrounding regions of this test
sample for other groups and clusters using our method and verify the existence
of any significant findings by visual inspection, deriving estimates of the
false positive rate that are as low as 6 per cent. The method is also tested on
simulated Rubin data from their DP0 programme, which yields complementary
results of a good recovery rate and low false positives.
