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institute/department: "FNWI: Astronomical Institute Anton Pannekoek IAP" and publication year: "1998"
| Authors||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|
|Title||Optical Follow-Up of GRB 970508|
|Journal||Astrophysical Journal Letters|
|Faculty||Faculty of Science|
|Institute/dept.||FNWI: Astronomical Institute Anton Pannekoek (IAP)|
|Keywords||Gamma ray bursts|
|Abstract||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 alpha = -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).|
|Note||©1998 American Astronomical Society|
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