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In this work, we study the X-ray timing and spectral evolution of thetransient low mass X-ray binary IGR J17091-3624 during first 66 days of its2011 outburst. We present results obtained from observations with twoinstruments, Rossi X-ray Timing Explorer (RXTE)/Proportional Counter Array(PCA) and SWIFT/X-ray telescope (XRT), between 09 February, 2011 and 15 April,2011. Using quasi-periodic oscillation classifications, power density spectrumcharacteristics, time-lag behavior and energy spectral properties, we determinesource states and their transitions at different times of the outburst. Duringthe first part of the evolution, the source followed trends usually observedfrom transient black hole X-ray binaries (BHXBs). Interestingly, a gradualtransition is observed in IGR J17091-3624 from the low-variability SIMS,commonly seen in BHXBs, to a high-variability state with regular, repetitiveand structured pulsations, seen only from GRS 1915+105 (also known as 'rho'class variability/'heartbeat' oscillations). We study the time evolution ofcharacteristic time-scale, quality factor and rms amplitude of heartbeatoscillations in IGR J17091-3624. We also present a detailed comparison of thetiming and spectral properties of heartbeat oscillations and their evolution inIGR J17091-3624 and GRS 1915+105.

X-ray spectral state evolution in IGR J17091-3624 and comparison of its heartbeat oscillation properties with those of GRS 1915+105