Timing Witness Signals Indicate Trustworthy Timing for G298936, a GW Event Candidate

Document #:

LIGO-T1700483-v1

Document type:

T - Technical notes

Abstract:

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 G298936, observed
at 1187529256= Wed Aug 23 13:13:58 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.

Files in Document:

• T1700483-aLIGO_BBH_Candidate_TimingWitness_G298936.pdf (4.1 MB)

Topics:

• Data Acquisition System

Authors:

• Stefan Countryman

Keywords:

timing witness

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• LIGO-T1700304: Timing Witness Signals Indicate Trustworthy Timing for Candidate G277583
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• LIGO-T1700384: Timing Witness Signals Indicate Trustworthy Timing for Candidate G296853
• LIGO-T1700437: Timing Witness Signals Indicate Trustworthy Timing for GW170814/G297595, a BBH Event Candidate
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Referenced by:

• LIGO-T1700484-v1: Timing Witness Signals Indicate Trustworthy Timing for G299232, a GW Event Candidate