Using a pointer from John Zweizig to the triggers from the new PDnMon, I looked at Qscans and Event Displays of the H1 ones to find a pattern.
My preliminary conclusion, looking at the top ~15-30 triggers when
ranked by chi^2, is that the triggers from the ASnI signals seem to be
very well correlated with seismic events, identified in inspiral and
BlockNormal glitches. They can provide a prompt, efficient and low
deadtime (~0.1%) veto for seismic events, and that would be welcome
news! They also catch other artifacts, like "ringdowns" and H2 not
locked.
The triggers from ASnQ signals do not seem to have an
obvious pattern, but they do catch some seismic and "ringdown"
transients (most common to AsnI triggers). Although their deadtime is
significantly larger, it is still relatively small (~0.4%).
I have taken the triggers after April 20 2007, where the configuration for the monitor seemed to change (?). There are 408 triggers, 318 (78%) in ASnQ, and 90 in ASnI. Some are not in science mode or the duration includes times not in science mode; selecting only triggers that are entirely in science mode we have 281 triggers, 225(80%) in ASnQ and 56 in ASnI. There are 27 ASnI and AsnQ triggers that have a common start GPS.
Between the times of the earliest trigger (861114720, Apr 20) and the latest trigger (866739840, Jun 24), the sum of the ASnQ trigger durations is 21660sec, or 6.0 hrs; the sum of the AsnI trigger durations is 4560sec, or 76min. In the same time interval, there are 4884591 sec in science mode, or 1357 hrs, or 56 days (87% duty factor!). Using ASnQ triggers as vetoes would represent a 0.44% deadtime; the ASnI triggers used as vetoes represent 0.09% deadtime.
The list of 56 ASnI triggers, in descending chi^2 order, are listed below:
Rank GPStart Dur Chisq
1 862764360 60 2277.1 EY seismic. Two inspiral glitches, no DQ flag. ED, Qscan; ED, Qscan.
2 865874640 60 1906.1 Site-wide seismic, 52-sec EY coil overflow flag. ED, Qscan.
3 863635080 60 927.8 BN, Inspiral glitches at 863635138, 150. EY seismic, high winds. No DQ flags. ED, Qscan1, Qscan2.
4 865180020 60 916.7 Loudest inspiral trigger in blind inj test period at 865180058; BN triggers at 865180042, 057, 069. EY seismic.
H1:SEVERE_LSC_OVERFLOW:v99 2sec later. ED, Qscan1, Qscan2.
5 866225220 60 887.5 Inspiral glitch at 866225241.80. SEVERE LSC OVERFLOW flag.
A strange seismic event (large spike in seismometers, see ED). Qscan, ED.
6 863353140 120 619.2 Inspiral glitch at 863353185.26, there was an unrelated injection 13sec earlier (that we would veto with this trigger!).
EY seismic noise is visible in Event Display, and Qscan looks seismic too. Qscan, ED.
7 861357060 60 283.5 Segment ends 60sec later, at 861357120.
8 861116820 120 219.7 Inspiral Glitch at 861116872.17 , PD_Overflow [861116888,861116890). Seismic?. ED, Qscan.
9 865279200 60 190.3 BlockNormal and inspiral glitch at 865279248, looks seismic. ED, Qscan.
10 864600600 180 123.9 A series of BN and inspiral glitches, with first one in the starting minute at 864600641.
DQ Flag SEVERE_LSC_OVERFLOW [864600640,864600643) vetoes this trigger, but not others nearby.
Strong seismic noise. Qscan, ED.
11 861405060 120 121.0 Inspiral and BN glitches at 861405112, looks seismic. ED, Qscan.
12 864677580 60 93.4 Several inspiral glitches, seismic. First one at 864677593, Qscan, ED, others at 614, 632, 656 (last one is due to filter, not to a glitch).
13 863413920 60 89.5 Inspiral glitch at 863413931, 2sec LSC SVR OVLF flag. Qscan, ED. Not seismic, ringdown pattern. Also an AsnQ trigger.
14 862265280 60 83.9 Inspiral glitch at 862265313, 3 sec LSCOVFLW flag, followed by others. Seismic. Qscan, ED.
15 861240480 60 83.9 Inspiral glitch at 861240515, another inspiral glitch at 536. Not seismic, ringdown pattern. It is also an ASnQ trigger. Qscan, ED.
16 864052200 60 46.9 Several inspiral glitches (first one is before this minute, at 185), seismic. Qscan, ED.
17 865884720 120 46.7 Several BN glitches (inspiral had database problems), seismic. >1min long ETMY COIL OVERFLOW flag. ED, Qscan.
18 861306360 60 25.9 Inspiral glitch at 861306392, SNR~25. No obvious glitch in Qscan or ED DARM_ERR, but Qscan shows some transients in ASnI,Q.
19 861238980 60 21.2 Inspiral glitch at 861239035, SNR ~100. Looks like a ringdown, not seismic. Not an ASnQ trigger. Qscan, No ED?
20 865361400 240 20.1 Several inspiral glitches, seismic, people at EX (consistent with length of this trigger). Qscan, ED.
21 865064040 60 19.9 Inspiral glitch, seismic. Qscan. ED.
22 866160120 60 15.1 No inspiral or BN glitch.
23 863197380 60 15.0 Inspiral glitch, SNR ~2,000, seismic. Qscan, ED.
24 862932660 60 14.9 Inspiral glitch at 862932691, SNR ~2,000, seismic noise. Qscan. ED.
25 861326700 120 14.3 No inspiral or BN glitch.
26 866165880 60 13.8 No inspiral or BN glitch.
27 861214920 120 13.7 Inspiral glitch (SNR 29.6) at 861214960. H2 not locked DQ flag, probably due to H2. Qscan.
28 862965360 60 13.5 No inspiral or BN glitch.
29 866167080 60 13.0 No inspiral or BN glitch.
30 863995920 120 12.6 No inspiral or BN glitch.
31 862490640 60 12.1
32 863830860 60 11.8
33 865131540 60 11.6
34 862343760 60 11.5
35 861257460 120 11.5
36 865630920 60 11.2
37 862658040 60 11.1
38 866599740 60 11.1
39 864153720 60 11.1
40 862650840 120 10.8
41 862645140 120 10.8
42 865609800 120 10.7
43 864126000 60 10.7
44 861226440 60 10.6
45 866295780 60 10.6
46 864428760 60 10.5
47 861381780 60 10.5
48 862553160 120 10.5
49 862706820 60 10.4
50 865487220 60 10.4
51 865454160 120 10.3
52 864112920 120 10.3
53 861211260 60 10.2
54 863731560 60 10.2
55 863362320 60 10.2 No inspiral or BN glitch.
56 865996020 120 10.1 Database problems, no glitch pages generated (no BN glitches, though).
The ASnQ triggers, ordered in decreasing chi^2, are listed below:
Rank GPStart Dur Chisq
1 861357060 60 1951.0 One of the ASI/Q ones, last minute in segment, segment ends at 861357120.
2 863413920 60 216.8 Inspiral glitch at 863413931, SEVERE_LSC_OVERFLOW [863413931,863413933). Not seismic, it has a ringdown pattern.
ED, Qscan. It is also an AsnI trigger.
3 864153720 120 177.6 No inspiral or BN glitch?
4 862482660 60 174.4 BN glitch that was identified by Shantanu as having AS1/4 anti-correlated with AS2/3; also H1-H2 coincidence.
Inspiral glitch at 862482707. SEVERE_LSC_OVERFLOW:v99 1sec later. It does *not* look seismic, has ringdown pattern.
ED, Qscan. It is *not* an AsnI trigger.
5 861175500 60 66.2 Last 62 sec in segment, ending at 861175562. Close to common end to H1/H2.
6 865361520 60 55.5 Segment ends 5' later at 865361885. Inspiral and BN glitch at 865361517. ED, Qscan. Also AsnI triggers (4min long).
ASC_Overflow:v99 13 sec later. Many short broadband glitches. Probably seismic noise due to incursions in EX station.
7 863120460 60 48.0 No glitch report, no inspiral or BN glitch?
8 864600600 180 46.5 Several seismic glitches; first one flagged with OVFLW, next one is not: ED, Qscan
9 863037420 120 45.9 Glitches minutes earlier, at 863037246 (with a SEVERE LSC OVFLW flag), and another later, at 863037792, but none at this time?
10 862946940 60 39.0 No inspiral or BN glitches.
11 866131740 60 37.5 No inspiral or BN glitches.
12 863038320 60 36.1 No inspiral or BN glitches.
13 862417320 60 35.9 No inspiral or BN glitches.
14 866298600 120 31.3 Inspiral (not BN) glitch at 866298656, ASC Overflow. Several H1/H2 glitches, probably seismic. Qscan
15 866295660 300 30.8
16 865259160 180 29.9
17 865177800 120 29.7
18 865869420 300 29.3
19 865163820 60 29.1
20 862706820 60 29.1
21 865783200 300 29.0
22 863482680 60 28.7
23 863905920 60 27.2
24 864656880 120 26.7
25 866160120 120 26.6
26 863017920 60 26.1
27 862955880 60 25.9
28 861240480 60 25.7
29 862693680 60 25.4
30 865870200 60 24.0
31 864202560 60 24.0
32 865274160 300 22.9
33 865863840 240 22.9
34 865280460 120 22.5
35 862759860 60 22.4
36 865015080 60 22.4
37 866197260 60 22.2
38 863995920 120 22.1
39 862414140 60 21.4
40 865885080 120 21.2
41 865015320 120 21.2
42 865605720 240 21.1
43 863192640 120 20.6
44 866221860 60 20.4
45 862849020 60 20.4
46 864584400 300 20.4
47 863294940 60 20.3
48 863126280 60 20.2
49 863791440 300 19.9
50 863219700 120 19.9
51 864671160 60 19.5
52 863798580 60 19.5
53 865781280 60 19.3
54 865619520 240 18.8
55 865455240 60 18.4
56 862762860 60 18.1
57 864428760 60 17.9
58 865920660 120 17.9
59 865777620 60 17.8
60 865019340 60 17.8
61 866077080 60 17.4
62 865142760 120 16.7
63 862324500 60 16.7
64 866237340 60 16.4
65 866165820 120 16.3
66 863415000 120 16.2
67 862594200 180 16.2
68 862328100 60 16.2
69 864666180 120 16.1
70 865921440 180 15.8
71 865874640 60 15.6
72 864864840 60 15.6
73 862937640 60 15.6
74 865145160 60 15.6
75 862766400 120 15.5
76 866236260 240 15.4
77 866717460 60 15.3
78 863544060 60 15.2
79 863025840 60 15.1
80 865916100 60 15.0
81 865875180 120 14.8
82 865807920 120 14.7
83 863200680 60 14.7
84 863809140 180 14.7
85 865288800 60 14.6
86 861326700 120 14.6
87 861214920 120 14.5
88 865684920 120 14.4
89 861114720 60 14.3
90 863271120 60 14.3
91 866604300 60 14.3
92 865630920 60 14.3
93 865013040 180 14.2
94 866389500 60 14.1
95 863002440 180 14.0
96 866209980 180 13.9
97 862772280 60 13.9
98 866229720 240 13.9
99 866261280 60 13.8
100 863936700 120 13.6
101 865635960 120 13.5
102 865608780 60 13.4
103 863335260 240 13.4
104 866394960 60 13.2
105 865609800 120 13.2
106 865883640 300 13.2
107 863814420 120 13.0
108 863471820 120 13.0
109 865914900 60 12.9
110 862587480 60 12.9
111 865415520 60 12.9
112 864962220 60 12.7
113 866216580 60 12.7
114 862343760 60 12.6
115 863362320 60 12.6
116 865788600 180 12.6
117 865774860 120 12.6
118 865121100 60 12.5
119 863233260 60 12.4
120 862650840 120 12.4
121 865834860 60 12.4
122 863735400 120 12.4
123 865818120 60 12.3
124 865402920 120 12.3
125 865515000 120 12.3
126 866337540 120 12.3
127 865439580 60 12.3
128 866441520 60 12.3
129 865612080 60 12.2
130 865056060 60 12.2
131 864742740 60 12.2
132 865512360 120 12.1
133 865393260 120 12.0
134 863801820 60 12.0
135 863024880 60 11.9
136 863760000 240 11.9
137 862935540 60 11.9
138 865463220 120 11.9
139 861257460 120 11.8
140 864126000 60 11.8
141 866599740 120 11.8
142 866049540 60 11.8
143 862490640 60 11.8
144 863234100 60 11.7
145 863848320 120 11.7
146 862265280 60 11.7
147 863247540 120 11.7
148 862701240 60 11.7
149 865875600 180 11.5
150 865277940 60 11.5
151 865636320 120 11.4
152 864750480 60 11.4
153 866208540 120 11.3
154 865803120 60 11.3
155 866161320 120 11.2
156 864908280 60 11.2
157 866162040 60 11.2
158 861428700 60 11.2
159 863301660 60 11.2
160 861389880 60 11.2
161 863051880 60 11.1
162 863353860 60 11.1
163 865504380 60 11.1
164 862868880 60 11.1
165 865155360 60 11.1
166 862851300 120 11.1
167 862287540 120 11.0
168 862330140 60 11.0
169 865834980 60 11.0
170 862553160 120 10.9
171 865772040 120 10.9
172 863193720 60 10.9
173 863525100 60 10.9
174 863355120 60 10.8
175 862909920 60 10.8
176 862645140 120 10.8
177 865890000 120 10.8
178 865448580 60 10.8
179 863820000 60 10.8
180 866324640 60 10.8
181 865535160 60 10.8
182 866068020 60 10.8
183 863009580 120 10.8
184 864900360 60 10.8
185 864852000 60 10.8
186 864603060 120 10.7
187 861211260 60 10.7
188 863757960 180 10.7
189 864677580 60 10.6
190 861460980 60 10.6
191 862346580 60 10.6
192 863197680 60 10.5
193 865532460 60 10.5
194 864941340 60 10.5
195 862598400 60 10.5
196 865450500 60 10.4
197 861122880 180 10.4
198 865129260 120 10.4
199 866340660 60 10.4
200 863597100 120 10.4
201 865625220 120 10.4
202 864129000 60 10.3
203 861443220 120 10.3
204 865488840 60 10.3
205 863364180 120 10.3
206 863626140 120 10.3
207 864421620 60 10.3
208 863794680 60 10.3
209 865014060 60 10.3
210 864053160 60 10.3
211 864953700 60 10.3
212 863014800 60 10.3
213 861295740 60 10.2
214 863205720 120 10.2
215 864677760 60 10.2
216 862728480 120 10.2
217 863114880 60 10.2
218 866512320 60 10.1
219 865851600 60 10.1
220 861405060 60 10.1
221 862628100 180 10.1
222 866168160 60 10.0
223 862776660 120 10.0
224 863808540 60 10.0
225 862395480 60 10.0
The list of 27 common I/Q triggers, ordered chronologically, are in the list below, where Phase=0 is Q and Phase=1 is I.
# GPStart Dur Phase Chisq
1 861211260 60 0 10.7 Segment ends 400 sec later, 861211648. Not inspiral or BNS glitch.
861211260 60 1 10.2
2 861214920 120 0 14.5 Inspiral glitch at 861214960, H2_Not_Locked [861214958,861215050), Qscan.
861214920 120 1 13.7
3 861240480 60 0 25.7 Inspiral glitch at 861240515, no DQ flag. Worse chi^2 in I than Q. Ringdown pattern, no seismic noise obvious. ED, Qscan.
861240480 60 1 83.9
4 861257460 120 0 11.8 No inspiral or BN glitch.
861257460 120 1 11.5
5 861326700 120 0 14.6 No inspiral or BN glitch.
861326700 120 1 14.3
6 861357060 60 0 1951.0 Last minute in segment, segment ends at 861357120.
861357060 60 1 283.5
7 861405060 60 0 10.1 Inspiral and BN glitches at 861405112, looks seismic. Worse chi^2 and longer in I than Q. ED, Qscan.
861405060 120 1 121.0
8 862265280 60 0 11.7 Several BN and inspiral glitches, at 862265313, 315, 324. PD_Overflow [862265312,862265315) vetoes two of them, not the last one.
862265280 60 1 83.9 Looks seismic. ED, Qscan.
9 862343760 60 0 12.6
862343760 60 1 11.5
10 862490640 60 0 11.8
862490640 60 1 12.1
11 862553160 120 0 10.9
862553160 120 1 10.5
12 862645140 120 0 10.8
862645140 120 1 10.8
13 862650840 120 0 12.4
862650840 120 1 10.8
14 862706820 60 0 29.1
862706820 60 1 10.4
15 863362320 60 0 12.6
863362320 60 1 10.2
16 863413920 60 0 216.8
863413920 60 1 89.5
17 863995920 120 0 22.1
863995920 120 1 12.6
18 864126000 60 0 11.8
864126000 60 1 10.7
19 864153720 120 0 177.6
864153720 60 1 11.1
20 864428760 60 0 17.9
864428760 60 1 10.5
21 864600600 180 0 46.5
864600600 180 1 123.9
22 864677580 60 0 10.6
864677580 60 1 93.4
23 865609800 120 0 13.2
865609800 120 1 10.7
24 865630920 60 0 14.3
865630920 60 1 11.2
25 865874640 60 0 15.6
865874640 60 1 1906.1
26 866160120 120 0 26.6
866160120 60 1 15.1
27 866599740 120 0 11.8
866599740 60 1 11.1