[J. Driggers, T. Massinger, J. Kissel, A. Viets]

I ran the noise subtraction code in the gstlal calibration pipeline on the same time interval that Sheila used for the spectrum in LHO aLOG 47011.  The results are shown in the attached plots.  The first attachment is the ASD produced from only the time that was used in that aLOG, and the second ASD is based on over an hour of data.  The last plot is a time series of BNS range, in which the cleaned data averages about 2 Mpc better than the uncleaned data and goes above 100 Mpc several times.  I used gwpy.astro.inspiral_range() to compute the BNS range.  Unfortunately, this was not produced in low latency, due to the fact that the noise subtraction was being gated by the guardian channel GRD-ISC_LOCK_OK.  Apparently this is related to an issue with the squeezer guardian.  However, data like this should be produced soon in low latency by GDS-CALIB_STRAIN_CLEAN.

Note that the h(t) data used here was from the gstlal calibration pipeline, so the correction Jeff applied (LHO aLOG 47032) may not exactly apply here, the recent summary pages (e.g. 2019-02-03) show agreement to within ~5% between GDS and the front end.