It is a decade since the rst paper was published containing results determined using the general X-ray spectral-tting program XSPEC. Since then XSPEC has become the most widely used program for this purpose, being the de facto standard for the ROSAT and the de jure standard for the ASCA and XTE satellites. Probably the most important features of XSPEC are the large number of theoretical models ...

We report optical and IR observations of the ASCA X-ray pulsar system AX J0051-733. The relationship between the X-ray source and possible optical counterparts is discussed. Long term optical data from over 7 years are presented which reveal both a 1.4d modulation and an unusually rapid change in this possible binary period. Various models are discussed.

We present the results of optical spectroscopic identifications of a bright subsample of 2–10 keV hard X-ray selected sources from the ASCA Medium Sensitivity Survey in the northern sky (AMSSn). The flux limit of the subsample

We present the results of a BeppoSAX observation of the fastest pulsar known: PSR B1937+21. The ∼ 200 ks observation (78.5 (34) ks MECS (LECS) exposure times) allowed us to investigate with high statistical significance both the spectral properties and the pulse profile shape. The absorbed power law spectral model gave a photon index of ∼ 1.7 and N H ∼ 2.3 × 10 22 cm −2. These values explain bo...

We present the optical and X-ray study of the radioloud quasar 4C +74.26. The ASCA spectrum is rather complex with indications of a reflection component, a neutral iron line and a warm absorber. The underlying power law has a photon index of Γ = 2.03± 0.09. The soft X-ray flux in 1996 is nearly twice as high as that found in a ROSAT observation in 1993 without apparent spectral changes. The X-r...

We report on near-infrared and optical observations of the GRB 970616 error box and of the X-ray sources discovered by ASCA and ROSAT in the region. No optical transient was found either within the IPN band or in the X-ray error boxes, similarly to other bursts, and we suggest that either considerable intrinsic absorption was present (like GRB 970828) or that the optical transient displayed a v...

responded to a survey asking when they should break confidentiality and report student risk-taking behaviors to school administrators. Generally, counselors believed it to be more ethical to break confidentiality when the behaviors were directly observed (as opposed to reported by students) and when the behaviors occurred on school grounds during school hours. Results also suggest counselors we...