peter.saulson@LIGO.ORG - posted 13:03, Tuesday 10 November 2015 (23282)
DQ shift report for 5 - 8 November
(Full DQ shift report can be found at: https://wiki.ligo.org/viewauth/DetChar/DataQuality/DQShiftLHO20151105) Data quality during 5 - 8 November was mostly very good, up until the return of RF45 problems in the last few (UTC) hours of 8 November. Range hovered at or near 80 Mpc (yay!). Duty factor for each day (5th - 8th): 79.5%, 87.2%, 63.9%, 55.8%. The last day lost a lot of time to an earthquake, then high microseism. Many of the "usual suspects" are still present: the very loud glitches, the EY magnetic glitches, and the wandering line at ~640 Hz (and its harmonic). Daily CBC ran smoothly each day (which makes me happy!), and results were encouraging. For the BNS mass range, all four days showed clean histograms with no significant outliers in NewSNR; maximum NewSNR of the four days: 7.31, 7.40, 7.24, 7.39. The BBH range was pretty darn good, too: maximum NewSNR for each of the four days: 7.92, 8.74, 8.54, 7.69. (Any day when this is below 8 is excellent. Even days where the loudest event is below 9 is not too bad.) These searches do indeed respond to loud glitches, but the chi-squared weighting that creates the NewSNR statistic is (mostly) able to push those glitch responses down to low values where they don't hurt anything.
