Astrophysicists analyzing archival multi-wavelength observations have uncovered an extraordinary cosmic blast that defies established models of stellar demise. Deep-space monitoring of gamma-ray burst GRB 220706A revealed that the event’s central compact engine continuously flared in energetic X-rays for a record-breaking duration of 27 days. The persistent emission exceeded the duration of any previously documented gamma-ray burst by nearly three weeks, baffling researchers who typically observe such cataclysms fading within hours.
Standard astrophysical theory dictates that long-duration gamma-ray bursts occur when a massive, rapidly rotating star collapses into a black hole or highly magnetized neutron star, releasing relativistic jets of plasma into space. In the case of GRB 220706A, orbital X-ray telescopes tracked sustained and highly volatile energy pulses, suggesting that an unusually massive accretion disk fed the newborn compact object over an extended period or that complex jet precession delayed dissipation.
The discovery challenges conventional timelines regarding how newborn black holes consume surrounding stellar debris during extreme core-collapse events. Researchers indicated that future observations using next-generation transient observatories will investigate whether such long-lived explosive engines represent an underdetected class of ultra-long stellar catastrophes.
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Sources:
https://www.space.com/science/astrophysics/record-breaker-astronomers-spot-powerful-cosmic-explosion-that-lasted-27-days