Two Multifrequency Observations of 3C371

We present observations of 3C 371, made at frequencies from the radio to the ultraviolet, which were coordinated during two short time intervals separated by 3 months. We also present 1 keV X-ray flux densities measured at a different time. The multifrequency measurements indicate spectral steepening at visual wavelengths, and that an extrapolation of the ultraviolet continuum falls below the X-ray data. We explain the infrared through X-ray data as relativistically beamed synchrotron self-Compton emission and derive source parameters for two possible models. Our ultraviolet spectra both show strong Lyɑ emission at the same redshift as weak optical emission lines reported previously. We favor production of these lines by recombination of gas after its ionization by the ultraviolet to X-ray continuum radiation. We tentatively identify C IV and N v absorption lines in one of our ultraviolet spectra, which, if real, suggest the presence of a hot (~ 3 x 10^5 K) gaseous halo in 3C 371.