aLIGO LHO Logbook

LHO General

patrick.thomas@LIGO.ORG - posted 20:17, Monday 12 December 2016 - last comment - 11:40, Tuesday 13 December 2016(32491)

Ops Evening Mid Shift Summary

Have remained locked at NLN since 21:44 UTC.
Stood down for a GRB at 23:20 UTC. It appeared that the injections were not automatically blocked for the GRB, so I set the INJ_TRANS guardian node to INJECT_KILL manually. Requested INJECT_SUCCESS at 00:35 UTC.
Damped PI modes 26 and 28.
Ran a2l near beginning of lock.

Comments related to this report

keita.kawabe@LIGO.ORG - 21:10, Monday 12 December 2016 (32492)

Link

About the GRB, it turns out that the guardian was doing the right thing.

The alert was received at 2016-12-12 23:20:22 UTC, but the actual GRB event was at 2016-12-12 15:38:59, hours before the alert.

Since the alert came after our standard window of one hour, the guardian didn't block the injeciton.

patrick.thomas@LIGO.ORG - 23:13, Monday 12 December 2016 (32493)

Link

We just got another GRB alert at 07:05 UTC. This time the event time is around the same time as the created time. The INJ_TRANS guardian did not change again. Perhaps this is because LLO is not locked?

keita.kawabe@LIGO.ORG - 11:40, Tuesday 13 December 2016 (32516)

Link

I and Patrick looked at the trend of H1:GRD-INJ_TRANS_STATE_N, and actually GRB made the guardian transition to state 30 (EXTTRIG_ALERT_ACTIVE) for an hour (attached).

The GRB event is this one: https://gracedb.ligo.org/events/view/E265603

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