Katie Rink, Jess McIver
Summary: Brian Lantz wondered if leap day was a new record. We looked into the duration of coincident H-L observing mode stretches before and after the October commissioning break. Leap day was a new O3 (and likely all-time) H-L coincident observing mode record by more than 16 hours.
- Figure 1 shows a histogram of continuous observing mode segments for LHO using bin widths of 1 hour, with O3a and O3b plotted on top of one another. Note that the y-axis is log scale.
- Figure 2 shows the same but for LLO.
- Figure 3 shows the same but for the LLO and LHO coincident times, calculated using the GWpy segment intersection function.
In O3a, the longest coincident observing mode stretch was 32.4 hours. In O3b, the longest coincident observing mode stretch was 48.8 hours.
Our main findings are summarized in the table below.
|
|
L1 O3a |
L1 O3b |
H1 O3a | H1 O3b | Both O3a | Both O3b |
|---|---|---|---|---|---|---|
| Longest (Hr) | 46.4 | 91.5 | 44.8 | 50 | 32.4 | 48.8 |
| Average (Hr) | 6.2 | 6.6 | 6.1 | 6.5 | 3.6 | 3.8 |
I queried observing mode segments using DMT-ANALYSIS_READY:1 flag for L1 and H1, and the intersection between L1 and H1 in the time span of O3a and O3b independently. O3a was defined as Apr 01 2019 00:00:00 UTC - Oct 01 2019 14:00:00 UTC, O3b was defined as Nov 01 2019 18:00:00 UTC - Mar 23 2020 00:00:00 UTC.
The code I used can be found here.
