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Reduced Data Base, .MH and .FB Files


Availability: At NSSDC, Ready for Offline Distribution (or Staging if Digital)

Time span: 1977-08-21 to 1979-01-08


This data set was obtained from the Low Energy Detectors (LEDs) of the Hard X-ray and Low-Energy Gamma-ray Instrument when the satellite was spinning. The data consist of event counts and detector lifetimes for four broad energy channels for each of the two LEDs, and have been binned and accumulated in a .MH file as a function of satellite orientation. Each of these files is named MQaaaabbbb.MH, where aaaa (or aaa) is the sequence number of the first orbit of data and bbbb is the sequence number of the last orbit of data included in the file. Each data record contains the data accumulated in one satellite orientation bin. Records do not exist for those orientation bins in which no data were accumulated. Estimates of the background component of the count rate data in the .MH files are parameterized in the .FB files. Each of the .FB files contains the parameters for both LEDs for one broad energy channel. The file names are of the form MaaaabbbbX.FB, where aaaa is the beginning sequence number, bbbb is the end sequence number, and X is the energy channel code. This data set consists of binary magnetic tape covering the time span August 21, 1977, to January 8, 1979. The multifiled tapes were created on a Data General Nova 830 computer. For more detailed information on this data set, contact Dr. Duane E. Gruber, C-011, Center for Astrophysics and Space Astronomy, University of California-San Diego, La Jolla, CA 92093.

Alternate Names

  • Reduced Data Base, .MH + .FB File


  • Astronomy: Gamma Ray


  • 77-075A-04C

Additional Information



Questions and comments about this data collection can be directed to: Coordinated Request and User Support Office



NameRoleOriginal AffiliationE-mail
Dr. Alan M. LevineData ProviderMassachusetts Institute of
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