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We analyse the aperiodic flaring features, also known as shots, observed inCyg X-1 in the 0.1-80 keV energy band using a 6.39 ks simultaneous observationwith AstroSat and NICER. We detect 49 simultaneous shots in the soft and hardX-ray bands with NICER and AstroSat-LAXPC, respectively. We observe the shotprofile for the first time in soft X-rays (0.1-3 keV), which shows a spectralpeak at $\sim$2 keV. Using time-averaged spectroscopy, we measured thetruncation of the inner accretion disk at $6.7\pm0.2$ gravitational radii. Theshot-phase resolved spectroscopy allowed us to identify the origin of some ofthe brightest aperiodic peaks in the soft X-rays. We find that the accretionrate is consistent with a constant during the shots while the inner edge of theaccretion disk moves inwards/outwards as these shots rise/decay. We discuss thepossible mechanisms causing the swing in the inner radius.

Probing the shot behaviour in Cygnus X-1 using simultaneous AstroSat-NICER observation