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We report on the first detection of ionospheric disturbances caused by shortrepeated gamma-ray bursts from the magnetar SGR J1550-5418. Very low frequency(VLF) radio wave data obtained in South America clearly show sudden amplitudeand phase changes at the corresponding times of eight SGR bursts. Maximumamplitude and phase changes of the VLF signals appear to be correlated with thegamma-ray fluence. On the other hand, VLF recovery timescales do not show anysignificant correlation with the fluence, possibly suggesting that the bursts'spectra are not similar to each other. In summary, the Earth's ionosphere canbe used as a very large gamma-ray detector and the VLF observations provide uswith a new method to monitor high energy astrophysical phenomena withoutinterruption such as Earth Occultation.

First Very Low Frequency detection of short repeated bursts from magnetar SGR J1550-5418