0220094

We propose a Target of Opportunity Observation of the recurrent pulsating transient X0115+63 in Outburst.We propose two observations of 200 ksec each (total 400 ksec) to be performed at two different luminosity states according to a strategy that depends on the type of the outburst. The key scientific objectives of the proposal are: measurement of the position width and depth of multiple harmonics across the pulse phase measurement of the shapes of the harmonic so to test the different models for line formation study of the dependence of the cyclotron structures on the luminosity and possibly measure the physical heights of the scattering region measurement of the QPO and testing of the rotating warp/lump model. We will also search for red-shifted gamma-ray lines particularly 2.2 MeV photons from deuterium formation from nuclear processes at the neutron star polar cap. [truncated! Please see actual data for full text]