venera 11 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 11 occurred on january 27, 1980