Analysis on RXTE, INTEGRAL and ROTSE IIId observations of the X-ray   Pulsar 4U 1907+09
  In this paper we present our recent timing and spectral analysis of the X-ray pulsar 4U 1907+09. Our X-ray data consist of an extended set of RXTE & INTEGRAL observations that were analyzed before ({\c{S}}ahiner et al. 2012). From the X-ray observations we extend the pulse period history of the source and obtain a revised orbital distribution of the X-ray dips. Using ROTSE IIId optical observations, we present the long term optical light curve of the source to have an understanding of long term optical behaviour. 
S. Sahiner (1), S. C. Inam (2), A. Baykal (1), U. Kiziloglu (1) ((1)   Middle East Technical University, (2) Baskent University)
astro-ph.HE