Purpose of the flight and payload description

The detector essentially consisted of an array of 16 independent square NaI(Tl) scintillator crystals, fourteen of which were 10 mm thick and the other two 3 mm.

During this flight four galactic X-ray sources were observed, namely the transient recurrent X-ray pulsar A0535+26, the Crab Nebula, Cygnus X-1 and X Persei.

Details of the balloon flight

Balloon launched on: 10/4/1980 at 23:02 utc
Launch site: Columbia Scientific Balloon Facility, Palestine, Texas, US  
Balloon launched by: National Scientific Balloon Facility (NSBF)
Balloon manufacturer/size/composition: Zero Pressure Balloon Winzen 727.460 m3 (15.24 Microns - Stratofilm) - SF 404.85-060-NSCR-01
Balloon serial number: W26.59-2-01
Flight identification number: 1220P
End of flight (L for landing time, W for last contact, otherwise termination time): 10/5/1980 at 13:18 utc
Balloon flight duration (F: time at float only, otherwise total flight time in d:days / h:hours or m:minutes - ): F 15 h
Landing site: 17 Miles N of Meridian, Mississippi, US
Payload weight: 1387 kgs

External references

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