In-flight verification of the FREGATE spectral response
  We present the first results of the in-flight validation of the spectral response of the FREGATE X/gamma detectors on-board the HETE-2 satellite. This validation uses the Crab pulsar and nebula as reference spectra. 
J-F. Olive, J-P. Dezalay, J-L. Atteia, C. Barraud, N. Butler, G. B.   Crew, J. Doty, G. Ricker, R. Vanderspek