Abstract
Delayed ‘pair-echo’ signal from interactions of very-high-energyγrays in the intergalactic medium can be used for the detection of the intergalactic magnetic field (IGMF). We used the data of theFermi/LAT telescope coupled with LHAASO observatory measurements to confirm the presence of IGMF along the line of sight to theγ-ray burst GRB 221009A. Comparing theFermi/LAT measurements with the expected level of the pair-echo flux, set by the multi-TeV LHAASO detection, we derived a lower bound 10−19G on the IGMF with correlation lengthllarger than 1 Mpc, improving asl−1/2for shorter correlation lengths. This provides an independent verification of the existence of a lower bound on IGMF in the voids of the large-scale structure, previously derived from the observations of active galactic nuclei.
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