excitation ended just before we got a GRB alert, but I was making an excitation at the time of the GRB (LLO was not in observing so we were taking advantage of some single IFO time to investigate noise at 78 Hz in DARM that may come from EX).
When we heard the alert I stopped the dtt session and Jeff B went to observing, but there were times even when we weren't in observing that there were no excitations running. Grace DB lists 1127747079.41 as the event time for the first GRB alert, and unfortunately my excitation was running at that time. My last excation was ramping down by 1127747090 as shown in the first attached dataviewer screenshot, where the GRB time is approximately in the middle of the plot, so I was exciting the ETMX ISI at the time of the event.
The two channels that I was putting excitations on were H1:ISI-ETMX_ST2_ISO_Y_EXC and H1:ISI-ETMX_ST2_ISO_Y_EXC. These were white noise excitations that produced ISI motions of 0.1 nm/rt Hz at 20 Hz with an amplitude that slowly drops off as the frequency increases until 100 Hz (0.02 nm/rt Hz). The excitation was bandbassed from 20Hz-200 Hz. They produced no features in the DARM spectrum, although they were intended to excite the peaks at 78-80 Hz.
excitation ended just before we got a GRB alert, but I was making an excitation at the time of the GRB (LLO was not in observing so we were taking advantage of some single IFO time to investigate noise at 78 Hz in DARM that may come from EX).
When we heard the alert I stopped the dtt session and Jeff B went to observing, but there were times even when we weren't in observing that there were no excitations running. Grace DB lists 1127747079.41 as the event time for the first GRB alert, and unfortunately my excitation was running at that time. My last excation was ramping down by 1127747090 as shown in the first attached dataviewer screenshot, where the GRB time is approximately in the middle of the plot, so I was exciting the ETMX ISI at the time of the event.
The two channels that I was putting excitations on were H1:ISI-ETMX_ST2_ISO_Y_EXC and H1:ISI-ETMX_ST2_ISO_Y_EXC. These were white noise excitations that produced ISI motions of 0.1 nm/rt Hz at 20 Hz with an amplitude that slowly drops off as the frequency increases until 100 Hz (0.02 nm/rt Hz). The excitation was bandbassed from 20Hz-200 Hz. They produced no features in the DARM spectrum, although they were intended to excite the peaks at 78-80 Hz.