XCAT: The JANUS X-Ray Coded Aperture Telescope

A. D. Falcone, D. N. Burrows, S. Barthelmy, W. Chang, D. Fox, J. Fredley, N. Gehrels, M. Kelly, R. Klar, D. Palmer, S. Persyn, K. Reichard, P. Roming, E. Seifert, R. W.M. Smith, P. Wood, M. Zugger

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Scopus citations


The JANUS mission concept is designed to study the high redshift universe using a small, agile Explorer class observatory. The primary science goals of JANUS are to use high redshift (6<z<12) gamma ray bursts and quasars to explore the formation history of the first stars in the early universe and to study contributions to reionization. The X-Ray Coded Aperture Telescope (XCAT) and the Near-IR Telescope (NIRT) are the two primary instruments on JANUS. XCAT has been designed to detect bright X-ray flashes (XRFs) and gamma ray bursts (GRBs) in the 1-20 keV energy band over a wide field of view (4 steradians), thus facilitating the detection of z>6 XRFs/GRBs, which can be further studied by other instruments. XCAT would use a coded mask aperture design with hybrid CMOS Si detectors. It would be sensitive to XRFs and GRBs with flux in excess of approximately 240 mCrab. In order to obtain redshift measurements and accurate positions from the NIRT, the spacecraft is designed to rapidly slew to source positions following a GRB trigger from XCAT. XCAT instrument design parameters and science goals are presented in this paper.

Original languageEnglish (US)
Title of host publicationSpace Telescopes and Instrumentation 2010
Subtitle of host publicationUltraviolet to Gamma Ray
StatePublished - 2010
EventSpace Telescopes and Instrumentation 2010: Ultraviolet to Gamma Ray - San Diego, CA, United States
Duration: Jun 28 2010Jul 2 2010

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


OtherSpace Telescopes and Instrumentation 2010: Ultraviolet to Gamma Ray
Country/TerritoryUnited States
CitySan Diego, CA

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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