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Paper: ULS: An Upper Limit Server for X-ray and Gamma-ray Astronomy
Volume: 442, Astronomical Data Analysis Software and Systems XX (ADASSXX)
Page: 567
Authors: Saxton, R.; Gimeno, C. D.-T.
Abstract: Catalogs of sources discovered in high-energy, X-ray and Gamma-ray, observations exist for all the major missions and are well supported by the Virtual Observatory (VO) and specific sites such as HEASARC and LEDAS. It is much more difficult for an astronomer to find the upper limit to the flux at a position where no source was detected. Here, we present a web-based tool, which performs an on-the-fly calculation of the upper-limit, using images extracted from archives that support the Simple Image Access Protocol (SIAP). It is designed to work in a mission-independent manner on any photon counts image. Currently, XMM-Newton slew and XMM-Newton pointed data are supported. Extensions to other missions such as ROSAT, Chandra and INTEGRAL are planned.
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