Black Hole Signal: Rare Cosmic Discovery

Here’s a summary of the key data from the provided text about GRB 250702BDE:

* What it is: ⁢ GRB 250702BDE is a gamma-ray burst (GRB) – a catastrophic explosion. It’s notable as it’s the longest-duration GRB ‍ever observed in 50 years of observation and, uniquely, it repeats periodically. Normally, GRBs are one-time events as the⁣ source is⁣ destroyed.
* Discovery & Confirmation: Initially thought to be within the Milky way, observations from⁣ telescopes ⁣in Chile (Very Large Telescope) and the Hubble Space Telescope confirmed it originated outside our ⁢galaxy. The Einstein Probe telescope detected activity from⁤ it even before the main event was observed.
* Why it’s strange: The repeating nature of the‍ explosion is unprecedented.
* Possible Explanations: Scientists are considering two main hypotheses:
⁢ * Giant Star ⁢Death: ⁢ A star ‍40⁤ times the mass of the sun exploded, but something (“center machine”) remains active.
* tidal Disruption Event (TDE): ⁢A star (possibly a white dwarf) was torn apart by a black hole, but this would require a medium-mass black hole – a type of black hole that ‍is theorized but rarely⁤ observed.
* Significance: This event could provide the first strong evidence for ⁤the existence of ⁢medium-mass black ⁢holes,which are a long-standing puzzle in astronomy.