TITLE: GCN CIRCULAR NUMBER: 26554 SUBJECT: LIGO/Virgo S191222n: not observable by Fermi-GBM DATE: 19/12/22 14:27:01 GMT FROM: Rachel Hamburg at UAH R. Hamburg (UAH) reports on behalf of the Fermi-GBM Team and the GBM-LIGO/Virgo group: At the time of S191222n (GCN 26543), Fermi was passing through the South Atlantic Anomaly from 17.8 minutes prior to 9.3 minutes after the trigger time; therefore the GBM detectors were disabled.