In this short note we propose a rough simple method to determine magnetic field without known distance and to determine distance itself. Here we consider only disk accretion. The first term on the right side represents acceleration of a NS from an accretion disk, and the second term represents deceleration. The form of the deceleration term is general, only typical radius of interaction should be changed. Lets rewrite eq.
Uncertainties mainly depend on applicability of that simple model.
We use here only 1993 outburst, described in Bildsten et al. The authors in Bildsten et al. In the maximum of the burst errors are rather small, and we neglect them. Points with large errors were not used. It is shown on both figures.