Fast blue optical transients are ultrahot, ultrafast and difficult to explain.
FBOTs are most visible in optical wavelengths and change within a matter of days. They get bright rapidly, then fade away, much faster than astar explosion typically does. They also are new to science, having been observed for the first time only four years ago.
Gottlieb said he isn't sure. While GRBs and FBOTs both move at nearly the speed of light and have asymmetrical shapes, there's a key difference between the two displays."Stars that produce GRBs lack hydrogen," he explained."In FBOTs, we see hydrogen everywhere. So it could not be the same phenomenon.”
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