TITLE: GCN CIRCULAR NUMBER: 18448 SUBJECT: LIGO/Virgo G194575: Fermi GBM Observations DATE: 15/10/23 01:18:43 GMT FROM: Valerie Connaughton at NASA/MSFC/USRA LIGO/Virgo G194575: Fermi GBM Observations Lindy Blackburn (CfA), Michael S. Briggs (UAH), Eric Burns (UAH), Jordan Camp (NASA/GSFC), Nelson Christensen (Carleton College), Valerie Connaughton(USRA), Tito Dal Canton (MPG), Adam Goldstein (NASA/MSFC), Peter Jenke (UAH), Tyson Littenberg (USRA/UAH), Judith Racusin (NASA/GSFC), Peter Shawhan (UMD), Leo Singer (NASA/GSFC), John Veitch (Birmingham), Binbin Zhang (UAH) The region around 13h in Right Ascension, containing most of the probability for the LIGO CBC candidate G194575 reported by Singer et al. GCN 18442, was observed by Fermi GBM during the GW event. The region around 01h was occulted by the Earth. A search of the GBM Time-Tagged Event data between 8 keV and 40 MeV from 64 s before to 82 s after the CBC candidate event revealed no significant emission on search timescales in factors of 2 from 64 ms to 2.048 s. [GCN OPS NOTE(26oct15): In the FROM-line the SB was replaced with VC. SB manually processed the submission due to problems with VC's entry in the vetting list. The record has now been corrected.] [GCN OPS NOTE(15jun16): If you are looking for the P.Evans circ 18448 ("GRB 151022A: Swift-XRT refined Analysis"), please note that the ID for that circular has been changed to "18448a".]