Extragalactic transient candidates in the second <i>Swift</i>-XRT point source catalogue
Extragalactic transient candidates in the second <i>Swift</i>-XRT point source catalogue
ABSTRACT The second Swift-XRT Point Source catalogue offers a combination of sky coverage and sensitivity and presents an invaluable opportunity for transient discovery. We search the catalogue at the positions of inactive and active galaxies, and identify transient candidates by comparison with XMM–Newton and ROSAT. We recover 167 previously known …