Important notice

Flux correction


  • There can be additional systematic error on CModel color because the deblend processing does not work correctly for the area where objects are crowded, such as center of cluster.
  • In the multiband processing, the PSF is not matched for aperture flux measuring. This could impact the color analysis.

If these concerns severely affect your work, please contact helpdesk(

Hardware fault in some CCDs

We confirm some patterns on images due to a specific CCD or to fail FLAT image creation. You can avoid these issues by masking in pipeline processing.

The way to remove patterns is described in There is an artificial pattern on CORR or Coadd image caused by a specific CCD problem . If you analyze the data observed after 21st Nov. 2016, and fail to create FLAT images, please refer to Failed to create FLAT images due to a specific CCD .