SEARCHING FOR 'CHANGING LOOK. SEYFERT GALAXIES

With the aim of discovering more sources which change their appearance fromComptonthin (if Seyfert 2s) or unabsorbed (if Seyfert 1s) toreflectiondominated, we propose to observe, for 10 ks each, four objects whichhave been proposed to be the optical counterparts of Xray sources in theGrossan LMA HEAO1 catalog. The four candidate counterparts have been later onobserved with imaging Xray instruments, and found on those occasions to be muchfainter. The XMM Newton observations, if catching the sources at much brighterfluxes than during the previous hard Xray imaging observations, would confirmtheir transient nature. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]