ar X iv : a st ro - p h / 98 02 16 0 v 1 1 2 Fe b 19 98 Optical follow - up of GRB 970508

نویسندگان

  • T. J. Galama
  • P. J. Groot
  • J. van Paradijs
  • C. Kouveliotou
  • R. G. Strom
  • R. A. M. J. Wijers
  • N. Tanvir
  • J. Bloom
  • M. Centurion
  • J. Telting
  • R. G. M. Rutten
  • P. Smith
  • C. Mackey
  • S. Smartt
  • C. Benn
  • J. Heise
  • J. in ’ t Zand
چکیده

We report on the results of optical follow-up observations of the counterpart of GRB 970508, starting 7 hours after the event. Multi-color U, B, V, R c and I c band observations were obtained during the first three consecutive nights. The counterpart was monitored regularly in R c until ∼ 4 months after the burst. The light curve after the maximum follows a decline that can be fitted with a power law with exponent α = –1.141 ± 0.014. Deviations from a smooth power law decay are moderate (r.m.s. = 0.15 magnitude). We find no flattening of the light curve at late times. The optical afterglow fluence is a significant fraction, ∼ 5%, of the GRB fluence. The optical energy distribution can be well represented by a power law, the slope of which changed at the time of the maximum (the spectrum became redder).

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تاریخ انتشار 1998