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

Understand

From the study of X-ray light curve and color-color diagram of the low mass X-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 of variability, which we name $\epsilon$ class.

• We have studied observations between MJD 51200 and 51450.
• The class shows unusual periodic-like variation in count rate during rise time of two x-ray bursts.
• The class take place when the source is in radio quiet state.