Optical follow-up of GRB 970508

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

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66 Scopus citations


We report on the results of optical follow-up observations of the counterpart of the gamma-ray burst GRB 970508, starting 7 hr after the event. Multicolor U-, B-, V-, Rc-, and Ic-band observations were obtained during the first three consecutive nights. The counterpart was monitored regularly in Rc 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 a = - 1.141 ± 0.014. Deviations from a smooth power-law decay are moderate (rms = 0.15 mag). 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).

Original languageEnglish (US)
Pages (from-to)L13-L16
JournalAstrophysical Journal
Issue number1 PART II
StatePublished - 1998
Externally publishedYes


  • Bursts
  • Gamma rays

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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