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COS-B observations of long term variability and absorption phenomena in the X-ray emission from Cen X-3.
Bignami, G. F.; Molteni, D.; Hermsen, W. +12 more
Summary: The CO S-B satellite has observed the X-ray source Cen X-3 in the energy range 2 to 12 keV between 1975 Decenber 24 and 1976 January 23. Preliminary results based on about 10% of the data from the X-ray detector indicate that the source increased in emission during this period reaching a broad maximum around January 8. The three entrances…
COS-B observation of high-energy gamma radiation from the Vela region.
Bignami, G. F.; Hermsen, W.; Boella, G. +11 more
Summary. Preliminary results from the ESA gamma-ray astronomy satellite COS-B are presented for the region of the Vela supernova remnant. From an analysis of about 20 % of the collected data an enhancement of the radiation above about 100 MeV is observed in a 30x30 bin containing PSR. The enhancement is still present for gamma-ray energies above a…
The Ability of Cos-B to Measure Gamma-Ray Bursts
Boella, G.; Gorisse, M.; Taylor, B. G. +2 more
The COS-B satellite for gamma-ray astronomy, launched on 7 August, 1975, features as part of the main instrument a 1.1 m2, 10 mm thick, plastic scintillator for the vetoing of charged particle events. This detector which has an average effective area of 360 cm2 for gamma rays in the interval 0.1 to 1 MeV has been instrumented…
Relevance of the feature ``cluster number'' in a non-parametric method for the automatic selection of high energy gamma-ray events in spark chambers
Buccheri, Rosolino; Di Gesù, Vito; Salemi, Sergio
An "ad hoc" feature is defined to improve the efficiency of non-parametric methods. The results obtained on the analysis of events detected by the COS-B satellite wire spark chamber are reported.