090344

We propose to study one known hyperluminous X-ray source NGC 470 HLX1 simultaneously with XMM and NuSTAR for the first time. Archival soft X-ray data suggest that the source exhibits a hard pulsator like spectra and shows a marginal hint of pulsed signal. This motivates us to detect the pulsation in the new high S/N data with high confidence and study its broadband spectral properties to understand its underlying accretion mechanism which was previously not possible due to unavailability of broadband X-ray data. Pulsar population in HLXs are rare hence if the detection of pulsation emerge to be a real signal NGC 470 HLX1 will be the second HLX pulsar. Therefore we propose to coordinate a simultaneous observation with 70 ksec XMM and 120 ksec NuSTAR exposure for NGC 470 HLX1. [truncated! Please see actual data for full text]