This catalog gives information on the triggered events detected by the
PVO instrument from 9/14/78 to 7/21/88. This catalog was taken from the
Ph.D. thesis of Kuan-Wen Chuang (UC-Riverside, 1990).
The Gamma Burst Detector aboard the Pioneer Venus Orbiter was designed to
record gamma ray burst intensity profiles with high time resolution. The
Detector consists of two identical sensors placed at the periphery of the
spacecraft equipment platform. They are diametrically opposite each other,
giving all sky coverage. Each sensor consists of a CsI scintillator, which
is bonded to a shell of Pilot B plastic scintillator used for charged particle
suppression. This assembly is optically coupled to a photomultiplier tube.
The amplified pulses are analyzed at five discriminator levels, corresponding
to energy bands of 100 - 200 keV, 200 - 500 keV, 500 - 1000 keV, and 1.0 - 2.0
MeV. High intensity events trigger the electronics to record in a high time
resolution mode. For these triggered events, spectral data are recorded
concurrently in each of the 4 energy channels at 187 ms or better resolution.
A time-to-spill algorithm records the total intensity in time bins of 11.7 ms
to 0.25 ms, depending on the count rate. For further details of the
instrumentation, see Klebesadel et al. (1980). Through 13 years of continuous
operation, the detectors and the trigger mechanism have remained stable,
resulting in a data base free from systematic effects.
Name
The date of the observation in format yy.mm.dd.
Time
The time that the burst was recorded.
Fluence
Energy flux in units (ergs/cm**2) X 10**-5.
Max_Flux
The maximum energy flux in units (ergs/cm**2-s) X 10**-5.
Peak_Count_Rate
The peak count flux in units counts/0.25 s.
Average_Background_Rate
Average background count rate in units counts/0.25 s.
Confirmed
Whether the burst was recorded by at least one other spacecraft.
Confirmations
Numbers indicate which other spacecraft also observed the burst. The key for
the confirming satellites is as follows:
-----------------------------------------------------------------------------
1. Prognoz - 7
2. Venera - 11 (Siene Experiment)
3. Venera - 12 (Siene Experiment)
4. Pioneer Venus Orbiter
5. International Sun - Earth Explorer
6. Vela
7. Venera - 11 (Konus Experiment)
8. Venera - 12 (Konus Experiment)
9. Helios - 2
10. Solar Maximum Mission/Gamma Ray Spectrometer
11. Prognoz - 9
12. Venera - 13 (Siene Experiment)
13. Venera - 14 (Siene Experiment)
14. Konus 13
15. Konus 14
16. Konus Experiment. Lab., or Prognoz - 9 experiment
17. HEAO - 3
-----------------------------------------------------------------------------
Klebesadel, R., Evans, W., Glore, J., Spalding, R., and Wymer, F., 1980
IEEE Trans on Geoscience and Remote Sensing, GE-18, 76.
Questions regarding the PVOTRIG database table can be addressed to the
HEASARC User Hotline.
Page Author: Browse Software Development Team
Last Modified: Thursday, 18-Jul-2002 12:56:04 EDT