LIGO Document T1700303-v1

Timing Witness Signals Indicate Trustworthy Timing for Candidate G275697

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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 a 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 datastreamís timing was perfect around Event Candidate G275697, observed at 1172257069= Mon Feb 27 18:57:31 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.
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