Aux channel list on O4a not updated

Data Analysis
1

Is anyone working on the auxiliary channel uploads on GWOSC for O4a? The channel list does not seem to be complete list the O3. Sampling rates are missing and too few channels. Also, somehow this list was on there since months before they released the data so I am wondering if there is a version mismatch.

2

Hi @Shan909, no, there is not a version mismatch. It is just that the detector was updated between O3 and O4, which reduced the number of channels needed for the activities described on https://gwosc.org/O4/auxiliary/ . The channel list was added in the same repository used for O3 when the data release was initially prepared and this is indeed a public repository so the list was visible in advance, but the data were published yesterday. I will check if it is possible to add the sampling time.

1 Like
3

Thank you @Shan909 for flagging this! Here are sample rates for the O4a auxiliary channels. Good idea to add this to the docs.

H1:CAL-PCALX_RX_PD_OUT_DQ 16384
H1:CAL-PCALY_RX_PD_OUT_DQ 16384
H1:IMC-WFS_A_DC_PIT_OUT_DQ 2048
H1:IMC-WFS_A_DC_YAW_OUT_DQ 2048
H1:LSC-POP_A_LF_OUT_DQ 2048
H1:LSC-REFL_A_RIN_OUT_DQ 16384
H1:OAF-IMC_WFS_A_DC_PIT_PREFILT_OUT_DQ 16384
H1:OAF-IMC_WFS_A_DC_YAW_PREFILT_OUT_DQ 16384
H1:OAF-REFL_A_RIN_PREFILT_OUT_DQ 16384
H1:PEM-EY_MAINSMON_EBAY_1_DQ 8192
H1:SUS-ETMX_L1_CAL_LINE_OUT_DQ 512
H1:SUS-ETMX_L2_CAL_LINE_OUT_DQ 512
H1:SUS-ETMX_L3_CAL_LINE_OUT_DQ 512
H1:SUS-PI_PROC_COMPUTE_MODE29_RMSMON 16

L1:ASC-X_TR_A_NSUM_OUT_DQ 2048
L1:CAL-PCALX_RX_PD_OUT_DQ 16384
L1:CAL-PCALY_RX_PD_OUT_DQ 16384
L1:IMC-WFS_B_I_PIT_OUT_DQ 2048
L1:OAF-IMC_WFS_B_I_PIT_PREFILT_OUT_DQ 16384
L1:PEM-EX_VMON_ETMX_ESDPOWER24_DQ 8192
L1:PEM-EY_MAINSMON_EBAY_1_DQ 8192
L1:SUS-ETMX_L1_CAL_LINE_OUT_DQ 512
L1:SUS-ETMX_L2_CAL_LINE_OUT_DQ 512
L1:SUS-ETMX_L3_CAL_LINE_OUT_DQ 512
L1:SUS-PI_PROC_COMPUTE_MODE5_RMSMON 16
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4

Also, you can also see the sample frequency of any channel like this:

>>> data = TimeSeries.fetch('L1:CAL-PCALX_RX_PD_OUT_DQ', start=1368980000, end=1368980010, host='nds.gwosc.org')
>>> df = 1/data.dt
>>> print(df)
16384.0 1 / s
1 Like
5

Thank you, that’s really useful. Was a bit busy with term end exams, looking forward to working on O4

6

Thanks, it’s there now