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Delayed "pair echo" signal from interactions of very-high-energy gamma raysin the intergalactic medium can be used for detection of the inter-galacticmagnetic field (IGMF). We use the data of Fermi/LAT telescope coupled withLHAASO observatory measurements to confirm the presence of IGMF along the lineof sight to the gamma-ray burst GRB221009A. Comparing the Fermi/LATmeasurements with the expected level of the pair echo flux, set by themulti-TeV LHAASO detection, we derive a lower bound $10^{-19}$ G on the IGMFwith correlation length $l$ larger than 1 Mpc, improving as $l^{-1/2}$ forshorter correlation lengths. This provides an independent verification ofexistence of a lower bound on IGMF in the voids of the Large Scale Structure,previously derived from the observations of active galactic nuclei.

Constraint on intergalactic magnetic field from Fermi/LAT observations of the "pair echo" of GRB 221009A