The JANUS X-ray flash monitor

A. D. Falcone, D. N. Burrows, S. Barthelmy, W. Chang, J. Fredley, 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

4 Scopus citations


JANUS is a NASA small explorer class mission which just completed phase A and was intended for a 2013 launch date. 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 Flash Monitor (XRFM) and the Near-IR Telescope (NIRT) are the two primary instruments on JANUS. XRFM 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. XRFM would use a coded mask aperture design with hybrid CMOS Si detectors. It would be sensitive to XRFs/GRBs with flux in excess of approximately 240 mCrab. The spacecraft is designed to rapidly slew to source positions following a GRB trigger from XRFM. XRFM instrument design parameters and science goals are presented in this paper.

Original languageEnglish (US)
Title of host publicationUV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XVI
StatePublished - 2009
EventUV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XVI - San Diego, CA, United States
Duration: Aug 3 2009Aug 3 2009

Publication series

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


OtherUV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XVI
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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