ROSAT Observations: Categories

6-digit numbers were assigned to each ROSAT Observation Request (ROR)
according to the following categories:

  000...   bad attitude
  001...   no acquisition
  0999..   safemode recoveries

  10....   calibration phase         (1990-Jun-16 ... 1990-Jul-11)
  11....     "
  12....     "                              ; attitude verification
  13....     "
  140...     "

  141...   calibration during mission
  142...     "
  160...     "                              ; some early ToOs

  150...   verification phase        (1990-Jul-16 ... 1990-Jul-30)

  17....   reduced pointing phase    (1991-May-25 ... 1991-Nov-04)

  180...   ToOs

  190...   All-Sky Survey pointings  (Survey completion in 1997-Feb)

  2.....   normal stars, white dwarfs

  3.....   cataclysmic variables

  4.....   neutron stars, black holes

  5.....   supernova remnants

  6.....   normal galaxies

  7.....   AGN

  8.....   cluster of galaxies

  9.....   diffuse X-ray emission, other

  93....   ROSAT All-Sky Survey fields

  999...   idle pointings


  ROR - ROSAT observation request
  ToO - target of opportunity