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Gamma-ray burst GRB221009A was of unprecedented brightness in gamma-rays andX-rays, and through to the far ultraviolet, allowing for identification withina host galaxy at redshift z=0.151 by multiple space and ground-basedoptical/near-infrared telescopes and enabling a first association - viacosmic-ray air-shower events - with a photon of 251 TeV. That is in directtension with a potentially observable phenomenon of quantum gravity (QG), wherespacetime "foaminess" accumulates in wavefronts propagating cosmologicaldistances, and at high-enough energy could render distant yet bright pointlikeobjects invisible, by effectively spreading their photons out over the wholesky. But this effect would not result in photon loss, so it remains distinctfrom any absorption by extragalactic background light. A simple multiwavelengthaverage of foam-induced blurring is described, analogous to atmospheric seeingfrom the ground. When scaled within the fields of view for the Fermi and Swiftinstruments, it fits all z<5 GRB angular-resolution data of 10 MeV or anylesser peak energy and can still be consistent with the highest-energylocalization of GRB221009A: a limiting bound of about 1 degree is in agreementwith a holographic QG-favored formulation.

Holographic Quantum-Foam Blurring, and Localization of Gamma-Ray Burst GRB221009A