1770013

The famous HMXB Vela X-1 has in recent years also be found to emit in the radio. The detection took place by chance while the X-ray source was in eclipse. In the coming days there will be further radio observations (ATCA plus MeerKat for the 2nd and 3rd) spaced out around the binary orbit to find clues on the unknown radio emission mechanism. A NuSTAR DDT has in the meantime also been approved. We would like INTEGRAL data to cover time around and covering the coordinated observations in order to enlarge the covered energy range and especially to have a better handle on the source variability before during and after the radio + X-ray observations. Other X-ray observatories (XMM-Newton NICER) are visibility constrained. Some Swift coverage will be done. [truncated! Please see actual data for full text]