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
- Balloon program for hard-X-ray astronomy IL Nuovo Cimento C Novembre-Dicembre 1984, Volume 7, Issue 6, pp 648-655
- Hard X-ray emission from the recurrent transient A0535 + 26 during its 1980 high-intensity outburst Advances in Space Research vol. 3, no. 10-12, 1984, p. 47
- Hard X-ray observation of galactic X-ray sources Advances in Space Research - Volume 5, Issue 3, 1985, Pages 125-128
- Hard X-ray observation of the transient X-ray pulsar A0535+26 Max-Planck Inst. Phys. and Astrophys. Accreting Neutron Stars p 112-116
- National Scientific Balloon Facility Annual Report FY 1981 National Center for Atmospheric Research, April 1982
- The Pulsed Spectrum of the Transient Source A0535+26 in the Hard X-Ray Range Physica Scripta. Vol. T7, 11 1-1 12, 1984
- The X-ray pulsar A0535 + 26 - Pulse profile and its time variability in hard X-rays Astrophysical Journal, Part 1 vol. 298, Nov. 15, 1985, p. 585
- The X-ray pulsar A0535+26 in hard X-rays - Average spectrum, pulse-phase spectroscopy, and spectral time variability Astrophysical Journal, Part 1 vol. 331, Aug. 1, 1988, p. 313
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