084434

AGN can be obscured by gas streams close to the black hole that shield remote regions from ionising radiation. We witnessed such an event in NGC 5548 and NGC 3783 where 90% of the soft X-rays are blocked by a dense gas stream close to the BLR. Our joint observations with XMM-Newton comma NuSTAR and HST-COS showed UV broad absorption lines associated with the X-ray absorption and allowed us to characterise this unique obscuration event completely. We propose to investigate a similar event in another Seyfert 1 using the same instruments. Swift monitoring openPar98 ksclosePar will be used to find the event comma which will be characterised by joint ToO observations with XMM-Newton openPar150 ksclosePar comma HST-COS openPar4 orbitsclosePar and NuSTAR openPar50 ksclosePar.