BackForwardInstrument:  TGRS 

Instrument details
Acronym TGRS
Full name Transient Gamma Ray Spectrometer
Purpose Observation of transient gamma-ray events, spectroscopic survey of cosmic gamma-ray transients, and measurements of gamma-ray lines in solar flares
Short description Assemblage of four spectroscopic units: detector cooler assembly, pre-amplifier and analog processing unit, all mounted on a tower on the +Z end of the spacecraft; and a digital. processing unit mounted in the body of the spacecraft. Measurement ranges: 15 keV - 8.2 MeV
Background Collaboration NASA-CNES. Part of a package of instruments to observe the solar wind
Scanning Technique Interplanetary space observation from the L1 Lagrange libration point
Resolution N/A (integrated over the interplanetary space)
Coverage / Cycle Interplanetary space at 1 s intervals
Mass Power Data Rate


Providing Agency NASA
Instrument Maturity Flown on an R&D satellite
Utilization Period: 1995 to 2000
Last update: 2021-11-10
Detailed characteristics
Satellites this instrument is flying on

Note: a red tag indicates satellites no longer operational, a green tag indicates operational satellites, a blue tag indicates future satellites

Instrument classification
  • Solar and space environment monitors
  • Space radiometer or spectrometer
WIGOS Subcomponents
  • Subcomponent 3
  • UV spectral imagery (e.g. GEO, HEO, MEO, LEO)
  • Gamma-ray spectrometer [from GEO, HEO, MEO, LEO]
Mission objectives
Primary mission objectives
  • Gamma-ray flux spectrum
Evaluation of Measurements

The following list indicates which measurements can typically be retrieved from this category of instrument. To see a full Gap Analysis by Variable, click on the respective variable.

Note: table can be sorted by clicking on the column headers
Note: * Primary mission objective.
VariableRelevance for measuring this variableOperational limitationsExplanation
Gamma-ray flux spectrum*4 - fairNo specific limitation.Interplanetary space viewing