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We report on multi-wavelength observations, ranging from the X-ray to radiowave bands, of the IPN-localized gamma-ray burst GRB 070125. Spectroscopicobservations reveal the presence of absorption lines due to O I, Si II, and CIV, implying a likely redshift of z = 1.547. The well-sampled light curves, inparticular from 0.5 to 4 days after the burst, suggest a jet break at 3.7 days,corresponding to a jet opening angle of ~7.0 degrees, and implying an intrinsicGRB energy in the 1 - 10,000 keV band of around E = (6.3 - 6.9)x 10^(51) erg(based on the fluences measured by the gamma-ray detectors of the IPN network).GRB 070125 is among the brightest afterglows observed to date. The spectralenergy distribution implies a host extinction of Av < 0.9 mag. Tworebrightening episodes are observed, one with excellent time coverage, showingan increase in flux of 56% in ~8000 seconds. The evolution of the afterglowlight curve is achromatic at all times. Late-time observations of the afterglowdo not show evidence for emission from an underlying host galaxy or supernova.Any host galaxy would be subluminous, consistent with current GRB host-galaxysamples. Evidence for strong Mg II absorption features is not found, which isperhaps surprising in view of the relatively high redshift of this burst andthe high likelihood for such features along GRB-selected lines of sight.

The Rapidly Flaring Afterglow of the Very Bright and Energetic GRB 070125