20 August 2009 The JANUS X-Ray Flash Monitor
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Abstract
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.
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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, "The JANUS X-Ray Flash Monitor", Proc. SPIE 7435, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XVI, 743508 (20 August 2009); doi: 10.1117/12.825373; https://doi.org/10.1117/12.825373
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