Discovery of Extremely Narrow Jet and 10 Teraelectronvolt Photons from the Brightest-of-All-Time Gamma-Ray Burst
The Large High Altitude Air Shower Observatory(LHAASO)first recorded the complete temporal evolution of the TeV emission from the brightest-of-all-time GRB 221009A,including the early rise and late decay phases.A high initial Lorentz factor and an extremely narrow jet,which is considered to be the brightest core of the jet,are inferred from the data,interpreting the unprecedent brightness of this GRB.LHAASO also detected photons above 10 TeV from this GRB for the first time and the intrinsic energy spectrum of gamma-rays can be described by a power-law after correcting for extragalactic background light absorption.Such a hard spectrum challenges the standard synchrotron self-Compton scenario of the afterglow emission above several teraelectronvolts.Detection of gamma-rays up to 13 teraelectronvolts from this GRB also hints more transparency in intergalactic space than previously expected,or new physics to explain the origin of the very high-energy signals.
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