Counting rate of SEDA-FIB between 19:00 and 22:00 UT of the SOL2011-03-07 event, together with the GOES differential flux. The ISS passed through the night region during 19:32–20:02 UT and 21:02–21:32 UT, as indicated by the black bar underneath the abscissa. The horizontal axis is presented in units of minutes, starting at 19:00 UT. The red diamonds represent neutrons coming from the solar direction. The brown dashed curve is the empirical curve for the inseparable background that may be described by the function |$3{\rm{*si}}{{\rm{n}}^4}[ {\pi ( {t - {t_0}} )/45} ].$| Details of the parameters are given in the text. There is a factor of about 10 between the green and brown dashed curves due to the selection of the solar-directed neutrons. The main background neutrons are coming from the direction of the pressurized vessel of the ISS. These neutrons are produced by cosmic rays colliding with the main ISS body. The scale is arbitrary for the GOES differential intensity. The exact scale is presented in figure 1b. The arrows indicate the peak points of hard X-rays in the energy band of 100–300 keV for the first peak and the second peak seen with FERMI-GBM. The high-intensity peak of the GOES data point at 21:45 UT was produced by a different M1.5 flare in the region of 1165. (Color online)