Timing Witness Signals Indicate Trustworthy Timing for Candidate G275404

Document #:

LIGO-T1700302-v2

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 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 datastream’s timing was perfect around Event Candidate G275404, observed at 1172082639= Sat Feb 25 18:30:21 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:

• aLIGO_BBH_Candidate_TimingWitness_G275404.pdf (4.3 MB)

Topics:

• Data Acquisition System

Authors:

• Stefan Countryman
• Zsuzsanna Marka
• Kenneth Corley

Notes and Changes:

Wrong event file uploaded previously; deleted it in this rev

Related Documents:

• LIGO-T1500516: Timing Witness Signals Indicate Trustworthy Timing for G184098, a BBH Event Candidate
• LIGO-T1600161: Timing Witness Signals Indicate Trustworthy Timing for G211117, a BBH Event Candidate
• LIGO-T1700039: Timing Witness Signals Indicate Trustworthy Timing for G268556, a BBH Event Candidate
• LIGO-T1700041: Timing Witness Signals Indicate Trustworthy Timing for Candidate G270580
• LIGO-T1700077: Timing Witness Signals Indicate Trustworthy Timing for Candidate G274296
• LIGO-E090003: Timing System Document Map Advanced LIGO

Referenced by:

• LIGO-T1700303-v1: Timing Witness Signals Indicate Trustworthy Timing for Candidate G275697
• LIGO-T1700304-v1: Timing Witness Signals Indicate Trustworthy Timing for Candidate G277583
• LIGO-T1700305-v1: Timing Witness Signals Indicate Trustworthy Timing for Candidate G284239
• LIGO-T1700306-v1: Timing Witness Signals Indicate Trustworthy Timing for Candidate G288732
• LIGO-T1700384-v1: Timing Witness Signals Indicate Trustworthy Timing for Candidate G296853
• LIGO-T1700437-v1: Timing Witness Signals Indicate Trustworthy Timing for GW170814/G297595, a BBH Event Candidate
• LIGO-T1700438-v1: Timing Witness Signals Indicate Trustworthy Timing for GW170817/G298048, a BNS Event Candidate
• LIGO-T1700482-v1: Timing Witness Signals Indicate Trustworthy Timing for G298389, a GW Event Candidate
• LIGO-T1700483-v1: Timing Witness Signals Indicate Trustworthy Timing for G298936, a GW Event Candidate
• LIGO-T1700484-v1: Timing Witness Signals Indicate Trustworthy Timing for G299232, a GW Event Candidate