The GstLAL Search Analysis Methods for Compact Binary Mergers in\n Advanced LIGO's Second and Advanced Virgo's First Observing Runs

After their successful first observing run (September 12, 2015 - January 12,\n2016), the Advanced LIGO detectors were upgraded to increase their sensitivity\nfor the second observing run (November 30, 2016 - August 26, 2017). The\nAdvanced Virgo detector joined the second observing run on August 1, 2017. We\ndiscuss the updates that happened during this period in the GstLAL-based\ninspiral pipeline, which is used to detect gravitational waves from the\ncoalescence of compact binaries both in low latency and an offline\nconfiguration. These updates include deployment of a zero-latency whitening\nfilter to reduce the over-all latency of the pipeline by up to 32 seconds,\nincorporation of the Virgo data stream in the analysis, introduction of a\nsingle-detector search to analyze data from the periods when only one of the\ndetectors is running, addition of new parameters to the likelihood ratio\nranking statistic, increase in the parameter space of the search, and\nintroduction of a template mass-dependent glitch-excision thresholding method.\n