ROSAT All Sky Survey (RASS)

The ROSAT telescope performed an all-sky survey in the X-ray band. The angular resolution of the ROSAT telescope in combination with the PSPC camera is approximately 1.8'.

Original data (WCS format) is be available here:

For more information on the survey, please visit

RASS Total (cts/s) Exposure time (s)

Maps in counts/sec or counts should be multiplied by 5.24559 to get counts per HEALPix pixel.

Total energy band (0.1-2.4 keV)

Map (in counts/sec): RASS_1_2048.fits

Map (in counts): RASS_COUNT_1_2048.fits

Hard energy band (0.5-2.4 keV)

Map (in counts):RASS_IM2_1_2048.fits

Soft energy band (0.1-0.4 keV)

Map (in counts): RASS_IM3_1_2048.fits


Exposure time map (in sec):RASS_EXP_1_2048.fits

Weight (Surface fraction of the FITS pixels intersecting the HEALPix pixel): RASS_COUNT_1_2048_weight.fits