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From the study of X-ray light curve and color-color diagram of the low massX-ray binary GRS 1915+105, observed by on board proportional counter array(PCA) of Rossi X-ray Timing Explorer (RXTE), we discover a new class ofvariability, which we name $\epsilon$ class. We have studied observationsbetween MJD 51200 and 51450. The class shows unusual periodic-like variation incount rate during rise time of two x-ray bursts. The class take place when thesource is in radio quiet state. The huge expansion in color-intensity diagramindicates the class to be an adjusting stage of increasing accretion rate.Spectral analysis shows that during lower count rate, the spectrum is hardpower-law dominating, indicating similarity towards hard intermediate state,and during higher count rate, the spectrum is thermal disk blackbody componentdominating, indicating similarity towards high soft state. Hence, this class isimportant in understanding the way of state transition leads to change inaccretion rate. No signature of any low frequency quasi periodic oscillationwas seen in this class. We also find that when the class was showing highercounts, the average RMS amplitude is significantly high for high energy band(14-60 keV) compared to low energy band (2-8 keV).

Discovery of one new class in the light curve of GRS 1915+105