venera 12 flight platform carried solar wind detectors, ionosphere electron instruments and two gamma ray burst detectors – the soviet-built konus and the french-built signe 2. the signe 2 detectors were simultaneously flown on venera 12 and prognoz 7 to allow triangulation of gamma ray sources. before and after venus flyby, venera 11 and venera 12 yielded detailed time-profiles for 143 gamma-ray bursts, resulting in the first ever catalog of such events. the last gamma-ray burst reported by venera 12 occurred on january 5, 1980. venera 12 used its ultraviolet spectrometer to study comet bradfield (c/1979 y1) on 13 february 1980, and reported spectrophotometric data until 19 march 1980.