Burns, E.Goldstein, A.Hui, C. M.Blackburn, L.Briggs, M. S.Connaughton, V.Hamburg, R.Kocevski, D.Veres, P.Wilson-Hodge, C. A.Altin, PaulChow, JongForsyth, PerryHolland, NathanKijbunchoo, NutsineeMansell, GeorgiaManske, MichaelMcClelland, DavidMcManus, DavidMcRae, TerryNguyen, ThanhRabeling, DavidScott, Susan M.Shaddock, DanielSlagmolen, BramWard, RobertWette, KarlYap, Min Jet2020-11-062020-11-060004-637Xhttp://hdl.handle.net/1885/214080We present a search for prompt gamma-ray counterparts to compact binary coalescence gravitational wave (GW) candidates from Advanced LIGO's first observing run (O1). As demonstrated by the multimessenger observations of GW170817/GRB 170817A, electromagnetic and GW observations provide complementary information about the astrophysical source, and in the case of weaker candidates, may strengthen the case for an astrophysical origin. Here we investigate low-significance GW candidates from the O1 compact binary coalescence searches using the Fermi Gamma-Ray Burst Monitor (GBM), leveraging its all sky and broad energy coverage. Candidates are ranked and compared to background to measure the significance. Those with false alarm rates (FARs) of less than 10−5 Hz (about one per day, yielding a total of 81 candidates) are used as the search sample for gamma-ray follow-up. No GW candidates were found to be coincident with gamma-ray transients independently identified by blind searches of the GBM data. In addition, GW candidate event times were followed up by a separate targeted search of GBM data. Among the resulting GBM events, the two with the lowest FARs were the gamma-ray transient GW150914-GBM presented in Connaughton et al. and a solar flare in chance coincidence with a GW candidate.The USRA co-authors gratefully acknowledge NASA funding through contract NNM13AA43C. The UAH co-authors gratefully acknowledge NASA funding from co-operative agreement NNM11AA01A. E.B. and T.D.C. are supported by an appointment to the NASA Postdoctoral Program at the Goddard Space Flight Center, administered by Universities Space Research Association under contract with NASA. D.K., C.A.W.H., C.M. H., and T.L. gratefully acknowledge NASA funding through the Fermi GBM project. Support for the German contribution to GBM was provided by the Bundesministerium für Bildung und Forschung (BMBF) via the Deutsches Zentrum für Luft und Raumfahrt (DLR) under contract number 50 QV 0301. A.v.K. was supported by the Bundesministeriums für Wirtschaft und Technologie (BMWi) through DLR grant 50 OG 1101. N.C. and J.B. acknowledge support from NSF under grant PHY-1505373. S.M.B. acknowledges support from Science Foundation Ireland under grant 12/IP/1288. Additional support for Advanced LIGO was provided by the Australian Research Council.application/pdfen-AU© 2019 The American Astronomical Society.gamma-ray burst: generalgravitational waves2019-01-2410.3847/1538-4357/aaf7262020-07-06Creative Commons Attribution 3.0 licence