It is understood from the passage that information concerning GRB afterglows ----.

Gamma-ray bursts (GRBs) are among the most
intense areas of research in high-energy
astrophysics, and they represent the largest known
explosions in the universe. Last year, NASA
launched the Swift satellite to rapidly locate and
observe GRBs and their afterglows at x-ray,
ultraviolet and optical wavelengths. These afterglow
observations are particularly important for the
understanding or these enormous explosions that
occur at cosmological distances near the edge of the
observable universe. Amateur astronomers, due to
their large numbers, their ability to respond quickly to
the randomly located GRBs and the availability of
highly sensitive CCD cameras, have been able to
provide important, early data on the optical
afterglows of GRBs in the past few years. Indeed, at
least one optical afterglow from a GRB was
discovered by an amateur astronomer. Observations
can be done with even a modest-size telescope,
provided the observations are made quickly enough.