In a paper published along with the announcement of the first detection of gravitational waves by the LIGO experiment, Volodymyr Savchenko (APC / FACe) and collaborators analysed data from INTEGRAL's ACS detector array.
INTEGRAL puts tight upper limits on the gamma-ray and hard X-ray prompt emission associated with the gravitational wave event GW150914, recently discovered by the LIGO/Virgo collaboration. The omni-directional view of the INTEGRAL/SPI-ACS has allowed to constrain the fraction of energy emitted in the hard X-ray electromagnetic component to be less than one millionth for the full high-probability sky region of LIGO/Virgo trigger.
INTEGRAL/SPI-ACS 3-sigma sensitivity as function of energy.
Dashed curves correspond to a hard GRB spectrum assuming a distance of 410 Mpc.