VizieR Online Data Catalog: ROSAT North Ecliptic Pole Survey (Gioia+, 2003)

The NEP region was observed many times by the ROSAT satellite since the RASS scan pattern overlapped at the ecliptic poles. While the mean RASS exposure time across the entire sky is approximately 400s, the NEP region exposure time approaches 40ks at the pole. The minimum, median, and maximum exposure times in the NEP survey regions are 1.7, 4.8, and 38ks, respectively.

(2 data files).