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.
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
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