Astronomers around the world are buzzing with excitement over a cosmic event that has left them scratching their heads in wonder. On July 2, 2025, a gamma-ray burst (GRB), dubbed GRB 250702B, was detected by NASAâs Fermi Gamma-Ray Space Telescope, setting off a chain of events that has left scientists puzzled.
GRBs are known for being extremely energetic explosions, ranking among the most powerful astrophysical events in the universe. They are typically caused by the merging of neutron stars or the explosive death of a massive star in a supernova event known as a collapsar. These cataclysmic events emit a focused jet of radiation and particles, which, when aimed directly at our solar system, appear as a GRB.
What sets GRB 250702B apart is its unprecedented duration. While GRBs are not uncommon in the vast expanse of the universe, lasting only a few hours at most, GRB 250702B continued to emit gamma rays for nearly a full day before fading away, leaving astronomers baffled.
Adelle Goodwin, an astronomer at Curtin University in Australia, leading follow-up radio observations with the Very Large Array in New Mexico, describes the event as “the longest one ever detected.” Moreover, the GRB exhibited unusual characteristics, including what appeared to be three distinct pulses during its extended duration, a phenomenon rarely seen in traditional GRBs.
The location of GRB 250702B within the dense, star-packed galactic plane of the Milky Way initially obscured its cosmic origins. However, recent observations using the James Webb Space Telescope revealed that the burst originated from a galaxy over five billion light-years away. This galaxy, characterized by its size and dust content, is the largest and brightest GRB-hosting galaxy ever observed, adding another layer of mystery to the enigmatic event.
The scientific community is divided on the possible causes of GRB 250702B, with theorists proposing two main scenarios. The event could have resulted from an unusually energetic collapse of a massive star or a tidal disruption event involving a white dwarf star and an intermediate-mass black hole. The duration and luminosity of the burst defy conventional explanations, hinting at the need for more exotic scenarios to unravel the mystery.
As researchers delve deeper into the origins of GRB 250702B, the possibility of an entirely new phenomenon emerging from this event remains tantalizing. Whether it stems from a black hole merger or some other cosmic spectacle, GRB 250702B serves as a testament to the boundless mysteries of the universe that continue to captivate and challenge astronomers worldwide.
