Cosmology Views

LIGO Detection 5 day Rule

Most of the LIGO detections follow a simple 5-day rule for an earth tide event:
When there is an earth tide event most of the associated LIGO detections are within a 5-day range from 2 days before to same day or to 2 days after.
O3 increased the sensitivity so more detections resulted from an earth tide. The distribution pattern is different before and after April 2019.

This analysis is below.

Here are the distributions
Format per line:
Earth tide event _ LIGO # Detections _  # Within 5_ # Not-in 5 _ # Total

LIGO has its detections in 2 lists:

1) in Wikipedia since O1 began in 2015

events:
PG-15-09-14  _ W1 _N0 _T1  or line = 1 within 5-day range, 0 not in range, 1 total

NM-15-10-12 _ W1 _N0 _T1
FM-15-12-25 _ W1 _N0 _T1
PH-17-01-04 _ W1 _N0 _T1
PG-17-04-15 _ W0 _N0 _T1
FM -17-06-09 _ W1 _N0 _T1
PG-17-08-02 _ W0 _N1 _T1
FM-17-08-07_ W1 _N0 _T1
PG-17-08-18 _ W2 _N1 _T3
NM-17-08-21 _ W1 _N0 _T1
NM-19-04-05 _ W0 _N1 _T1
PG-19-04-16 _ W0 _N1 _T1
FM-19-04-19_ W1 _N0 _T1
MJ-19-04-23_ W1 _N1 _T2
NM-19-05-04 _ W1 _N0 _T1
PG-19-05-13_ W2 _N1 _T3
FM-19-05-18 _ W2 _N2 _T4
NM-19-06-03 _ W1 _N0 _T1
NM-19-07-02 _ W2 _N2 _T4
FM-19-07-18 _ W1 _N0 _T1
NM-19-07-31 _ W0 _N2 _T2
FM-19-08-15 _ W1 _N0 _T1
NM-19-08-30 _ W3 _N1 _T4
FM-19-09-13 _ W1 _N2 _T3
NM-19-09-28 _ W2 _N2 _T4
FM-19-11-12 _ W2 _N2 _T4
PG-19-11-23 _ W3 _ N0 _T3
NM-19-11-26_ W1 _N0 _T1
FM-19-12-12_ W1 _N0 _T1
PG-19-12-18 _ W1 _ N0 _ T1


Earth tide events_ total _ 26

LIGO table in Wikipedia  _ total _ 50 _ 26 within 2 days

2) in GraceDB since O3 began in April 2019

Grace DB lists all detections including those that passed or failed all the analysis checks to be in the Wikipedia list.
The Wikipedia list includes the probabilities assigned to each inspiral event after its analysis.

GraceDB events

NM-19-04-05  _ W1 _N1 _T2 or line = 1 within 5-day range, 1 not in 5-day range, 2 total

PG-19-04-15  _ W0 _N1 _T1
MJ-19-04-19_ W1 _N0 _T1
MJ-19-04-23 _ W2 _N1 _T3
NM-19-05-04  _ W1 _N0 _T1
PG-19-05-13  _ W2 _N1 _T3
FM-19-05-18  _ W3 _N3 _T6
NM-19-06-03  _ W1 _N0 _T1
NM-19-07-02 _ W2 _N0 _T2
PG-19-07-05 _ W2 _N0 _T2
FM-19-07-16  _ W0 _N1 _T1
NM-19-07-31   _ W0 _N2 _T2
FM-19-08-15  _ W2 _N1 _T3
NM-19-08-30  _ W3 _N1 _T4
FM-19-09-13  _ W1 _N2 _T3
NM-19-09-28  _ W3 _N2 _T5
FM-19-11-12 _ W2 _N3 _T5
PG-19-11-23 _ W1 _N2 _T3
NM-19-11-26 _ W0 _N1 _T1
FM-19-12-12 _ W0 _N0 _T1
PG-19-12-18 _ W2 _ N0 _ T2

Earth tide events _ total _ 22

GraceDB list since O3 began April 2019 with LIGO list having earlier detections  _ total _ 56 _ 31 within 2 days


=== another representation ===

The combined list with only the deviations:

NM-15-09-13  _ +1
NM-15-10-12 _ 0
FM-15-12-25 _ +1
PH-17-01-04 _ 0
FM -17-06-09 _ -1
NM-17-07-23 _ +6
FM-17-08-07_ +2
PG-17-08-18 _ -4, -0
NM-17-08-21 _ +2
NM-19-04-05 _ 0, +3
PG-19-04-16 _ -4
FM-19-04-19_ +2
MJ-19-04-23_ +2, +3
NM-19-05-04 _ -1
PG-19-05-13_ -3, -1, 0
FM-19-05-18 _ -1, 0, +1, +3, +3, +6
NM-19-06-03 _ -1
NM-19-07-02 _ -2, -1, +4, +5
FM-19-07-18 _ 0, +1, +2
NM-19-07-31 _ -4, -3
FM-19-08-15 _ -1
NM-19-08-30 _ -2, -2, -1, +2
FM-19-09-13 _ -3, -3, +2
NM-19-09-28 _ -5, -4, 0, +2, +2
FM-19-11-12 _ -7, -3, -2, -2, +5
PG-1911-23 _ -3, -3, +1
NM-19-11-26 _ +3
FM-19-12-12 _ -8, -7, 0, +1, +1, +1, +3
PG-19-12-18 _ -2, +2

The LIGO detections are claimed to be detectable from almost anywhere in the universe so they should be in a random distribution. They are not random.
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Last updated (12/22/2019)