X-ray Flares/Bursts from GRS 1915+105 and the Two Component Accretion Flow

We present results of our analysis of a set of RXTE/PCA observations of X-ray flares/bursts with burst cycle ranging from 30 to 1300 s from theGalactic X-ray transient source GRS 1915+105 during last four years.These flares/bursts can be classified into four types: 1) regular burstswith short burst phase of ∼ 20 s (R1), 2) regular bursts with shortquiescent phase of ∼ 20 s (R2), 3) long regular bursts (R3) withburst cycle ≥ 1000 s, and 4) irregular bursts (IR). For all theobserved bursts, the duration of the quiescent phase is inverselyproportional to the square of the QPO frequency (2–10 Hz).