Astrophysicists found in one of the images taken by the James Web telescope a difference between previous observations of the same area of the sky using Hubble. A bright object is distinguished against the galaxy. A new telescope has observed it twice, with a difference of five days, while the object has become slightly dim in a second image. This behavior is characteristic of supernovas.
Scientists have discovered a bright object in images of the SDS.J141930.11+5251593 galaxy, which is between 3 billion and 4 billion light years away from Earth, so we see the death of a star that occurred three to four billion years ago.
The star dies in a fraction of a second, tells astrophysics, but the formed fire ball grows and becomes brighter for a few days, and then gradually disappears over the next few months. This is a moment by astronomical standards, so Webb was able to detect this supernova soon after its brightness reached its peak.
The search for short-lived space events, such as supernovas, is not a goal of James Webb, but it turns out to be capable of doing so, and since this space telescope can be seen further than any other scientific instrument, it offers opportunities to explore the near-death agony of the early generations of massive stars in the universe.
The high depth of James Webb covers a very small part of the sky, decoupling astrophysicists. For example, the first image, which represents the deepest view of the universe, is the part of the sky that will cover the sand in an outstretched hand.
So the actual probability that you will find a transition in the field you're looking at is quite small -- at least we thought it would be small -- but as you may have heard, every field of the telescope is now a deep field, so there are galaxies everywhere, and now we think, oh, we might have a really good chance of constantly detecting supernovas.