TITLE: GCN CIRCULAR NUMBER: 26739 SUBJECT: LIGO/Virgo S200114f: Upper limits from Fermi-GBM Observations DATE: 20/01/14 06:28:29 GMT FROM: Adam Goldstein at Fermi-GBM, USRA A. Goldstein (USRA) reports on behalf of the Fermi-GBM Team and the GBM-LIGO/Virgo group: For S200114f and using the latest cWB skymap, Fermi-GBM was observing 100% of the localization probability at event time. There was no Fermi-GBM onboard trigger around the event time of the LIGO/Virgo detection of GW trigger S200114f (GCN Circ. 26734). An automated, blind search for short gamma-ray bursts below the onboard triggering threshold in Fermi-GBM also identified no counterpart candidates. The GBM targeted search, the most sensitive, coherent search for GRB-like signals, was run from +/-30 s around merger time, and also identified no counterpart candidates. We set upper limits on impulsive gamma-ray emission for the LVC localization region at merger time. Using the representative soft, normal, and hard GRB-like templates described in arXiv:1612.02395, we set the following 3 sigma flux upper limits over 10-1000 keV, weighted by GW localization probability (in units of 10^-7 erg/s/cm^2): Timescale soft norm hard -------------------------------------- 0.128 s: 5.3 8.8 16. 1.024 s: 1.7 2.6 5.8 8.192 s: 0.5 0.9 1.9