Detection of GeV Emission from an Ultralong Gamma-Ray Burst with the Fermi Large Area Telescope
Yi-Yun Huang et al 2022 ApJL 940 L36
Researchers rule out the possibility that GRB 220627A is a gravitationally lensed gamma-ray burst, instead favoring the scenario in which it is intrinsically long, lasting more than 1,000 seconds.