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Published online by Cambridge University Press: 26 May 2016
A luminosity of the transient optical flashes of HMXB A0535+26 amounted to 1.4 × 1038 erg s−1, the same order of magnitudes as a power of giant X-ray outbursts of the system. The flashes are very similar to ultrafast bright (on the timescale of 1 msec) flashes which have been detected in LMXBs in the MANIA experiment. Apparently the flashes arise as a result of non-thermal processes which excited in both type of binaries. The program of searches of the high energy optical transients among HMXBs is proposed.