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Relationship between X-ray and ultraviolet emission in 3C 273
Paltani, S.; Walter, R.; Courvoisier, T. J. -L. +1 more
In 3C 273, ultraviolet flux and X-ray flux measured by BATSE are not well correlated, contrarily to predictions of several models, unless the X-ray flux lags the UV emission by 1.75 yr. The absence of observed correlation at small lag cannot be due to spectral variability. A Comptonizing corona model is however compatible with all UV and X-ray obs…
Ulysses/BeppoSAX observations of cosmic gamma-ray bursts
Piro, L.; Frontera, F.; Orlandini, M. +5 more
BeppoSAX has been added to the 3rd Interplanetary Network of gamma-ray burst detectors. Of the 8 events observed to date by Ulysses and the BeppoSAX Gamma Ray Burst Monitor (GRBM), four have been localized by triangulation, resulting in annuli whose 3σ widths are as small as 63''. These data give error boxes whose sizes are sometimes smaller than …