Patrick Kelly

Nov 22, 2024 | onlinelibrary.wiley.com | Alexander Davidson |Patrick Kelly |Julie Hirschfeld Davis |Maria Major

This review provides the first historical summary of tick and animal surveillance research as it pertains to Lyme disease in Canada. The rapid invasion of Ixodes ticks and Borrelia burgdorferi in Canada shows how Lyme disease became a growing One Health concern over the span of five decades. The reviewed surveillance studies identify areas of Ixodes and Borrelia burgdorferi emergence and endemicity, which match the areas in Canada that are high risk for Lyme disease.

Jun 8, 2023 | science.org | Patrick Kelly |Parminder Singh |Marine Fidelle |Zhen Cao

AbstractSome gamma-ray bursts (GRBs) have a tera–electron volt (TeV) afterglow, but the early onset of this has not been observed. We report observations with the Large High Altitude Air Shower Observatory of the bright GRB 221009A, which serendipitously occurred within the instrument field of view. More than 64,000 photons >0.2 TeV were detected within the first 3000 seconds. The TeV flux began several minutes after the GRB trigger, then rose to a peak about 10 seconds later.

May 11, 2023 | science.org | Cassandra Burdziak |Viridiana Villa-Islas |Xiaoshi Qian |Patrick Kelly

AbstractThe gravitationally lensed Supernova Refsdal appeared in multiple images, produced through gravitational lensing by a massive foreground galaxy cluster. After the supernova appeared in 2014, lens models of the galaxy cluster predicted an additional image of the supernova would appear in 2015, which was subsequently observed. We use the time delays between the images to perform a blinded measurement of the expansion rate of the Universe, quantified by the Hubble constant (H0).