First VLF detections of ionospheric disturbances due to Soft Gamma Ray Repeater SGR J1550–5418

We report the detection of sudden ionospheric disturbances (SIDs) due to a Soft Gamma Ray Repeater (SGR) SGR J1550-5418. This detection was made with receiving stations of Indian Centre for Space Physics which were monitoring Very Low Frequency signals (VLFs) from the VTX transmitter located near the southern tip of Indian sub-continent. This positive detections add to the list of a handful of similar detections of other GRBs and SGRs throughout the world.