COMPTEL DATASET TYPES
The following types of COMPTEL datasets have been delivered to the CGRO public
archive at the NASA Goddard Space Flight Center.
``Low-level'' Datasets (Level I)
- DRE = Binned Processed Event Matrices:
Spatially binned matrices containing the processed events for a
particular observation; intended for imaging analysis.
- EVP = Processed Event Message Lists:
An event-by-event list of all parameters recorded for accepted events
according to a particular set of selection criteria for a given
observation. These processed event data are intended for detailed
low-level timing, spectral, and imaging studies.
- HKD = Instrument Housekeeping Files:
Files containing a variety of recorded instrument parameters, required
for certain types of generic analysis.
- OAD = Instrument Orbit/Aspect Datafiles:
Files containing the orbital history of the spacecraft for a
particular observation, including instrument pointing and aspect
information.
- PBS = Burst Subsystem Count Spectra:
Processed count spectra (calibrated by energy and corrected for
dead-time effects) accumulated by the single-detector burst modules of
the instrument, organized by day of
acquisition. These data are intended for the spectral analysis of
cosmic bursts and solar flares.
- SHD = Instrument Live Time Files:
Files containing information relevant to the calculation of the
instrumental live time.
``High-level'' Datasets (Response and Background -- Level IIa)
- DRG = Geometric Response Matrices:
Spatially binned matrices containing the geometric viewing factors for
a given configuration of the instrument for a particular observation;
intended for imaging analysis.
- DRX = Exposure Matrices:
Spatially binned matrices representing the instrument exposure to the
sky for a particular observation; intended for imaging analysis.
- FAQ = Instrument Response Matrices:
Spatially binned matrices representing the efficiency of the
instrument in detecting incident gamma radiation
(i.e., the instrumental ``point-spread-function'' or PSF);
intended for imaging analysis.
- TIM = Files of Valid Observation Time Intervals:
Files containing lists of valid observation time intervals, when the
instrument was actually viewing a targeted source or region of the sky
(i.e., exclusive of SAA passages, earth occultation, telemetry
blackouts of the spacecraft, etc.).
``High-level'' Datasets (Standard Processing Results -- Level IIb)
- MEA = Maximum-entropy Skymaps:
Maximum-entropy deconvolved skymaps over
standard energy ranges, and for standard event-selection criteria.
- MLM = Maximum-likelihood Source Significance Maps:
Maximum-liklihood deconvolved skymaps for a particular observing
period, over standard energy ranges, and for standard event-selection criteria.
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