An on-line tool useful to estimate the visibility of a source is available at the following URLs:
Note however that the visibility window may be substantially restricted depending on the availability of guide stars for the gyroless mode. While a final assessment must await for on-board implementation, we warn that observation of a target at a specified time, even within the constraints allowed by the solar panels, may not be feasible.
Using the expected target properties (X-ray flux, spectral shape, variability, etc.), the observer must estimate whether the scientific objectives of his/her proposal (e.g. determination of spectral shape, variability, measurement of spectral features) can be achieved and should estimate the exposure time necessary to fulfill that purpose.
Such an assessment can be done using the tools available from the BeppoSAX SDC Web pages.
The SSDC Web Event Simulator and On-line Analysis Service
This tool allows proposers to simulate observations with the imaging instruments of BeppoSAX (and several other satellites). The simulated field can include both pointlike and extended sources with source positions, spectra etc. input by the user or automatically retrieved from a catalog of ROSAT sources. The output is a FITS/OGIP event file that can be analysed using standard X-ray analysis software or directly over the web using the SSDC interactive archive system.
A WWW tool for count-rate estimation (based on the HEASARC PIMMS) is available at the following URLs:
Detailed spectral simulations can be performed using XSPEC, as illustrated at the following URL:
In the same URL XSPEC macros are available to ease the (sometime complex) simulation procedure.
A new Web interface to XSPEC developed by HEASARC is available at