LIGO Document T1700482-v1

Timing Witness Signals Indicate Trustworthy Timing for G298389, a GW Event Candidate

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T - Technical notes
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Advanced LIGO data is taken by a DAQ that is directly driven in
hardware by the Advanced LIGO Timing Distribution System that ensures end-to-
end hardware-based timing signal integrity between the received GPS signal and the
ADC boards. The Advanced LIGO Timing Diagnostic System is separate additional
hardware that provides additional layers of timing information and crosschecks to
enable us to have versatile diagnostic information.
As an extra precaution, we examined the timing witness signals to ensure that the
aLIGO datastream's timing was perfect around Event Candidate G298389, observed
at 1187193064= Sat Aug 19 15:50:46 UTC 2017. We found that the DuoTone witness
indicated excellent timing performance on the sub-microsecond level and the IRIG-B
signals indicated precise second decoding.
timing witness

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