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The second Gravitational-Wave Transient Catalog reported on 39 compact binarycoalescences observed by the Advanced LIGO and Advanced Virgo detectors between1 April 2019 15:00 UTC and 1 October 2019 15:00 UTC. We present GWTC-2.1, whichreports on a deeper list of candidate events observed over the same period. Weanalyze the final version of the strain data over this period with improvedcalibration and better subtraction of excess noise, which has been publiclyreleased. We employ three matched-filter search pipelines for candidateidentification, and estimate the astrophysical probability for each candidateevent. While GWTC-2 used a false alarm rate threshold of 2 per year, we includein GWTC-2.1, 1201 candidates that pass a false alarm rate threshold of 2 perday. We calculate the source properties of a subset of 44 high-significancecandidates that have an astrophysical probability greater than 0.5. Of thesecandidates, 36 have been reported in GWTC-2. If the 8 additionalhigh-significance candidates presented here are astrophysical, the mass rangeof events that are unambiguously identified as binary black holes (both objects$\geq 3M_\odot$) is increased compared to GWTC-2, with total masses from $\sim14 M_\odot$ for GW190924_021846 to $\sim 182 M_\odot$ for GW190426_190642. Theprimary components of two new candidate events (GW190403_051519 andGW190426_190642) fall in the mass gap predicted by pair instability supernovatheory. We also expand the population of binaries with significantly asymmetricmass ratios reported in GWTC-2 by an additional two events (the mass ratio isless than $0.65$ and $0.44$ at $90\%$ probability for GW190403_051519 andGW190917_114630 respectively), and find that 2 of the 8 new events haveeffective inspiral spins $\chi_\mathrm{eff} > 0$ (at $90\%$ credibility), whileno binary is consistent with $\chi_\mathrm{eff} < 0$ at the same significance.

GWTC-2.1: Deep Extended Catalog of Compact Binary Coalescences Observed by LIGO and Virgo During the First Half of the Third Observing Run