| Quality Flags | WGACAT (1995) | WGACAT (2000) |
|---|---|---|
| 12 | - | A secure detection of a point source |
| 11 | - | Good detection located near the inner detector support structure(at ~20 arcmin radius) |
| 10 | A secure detection of a point source | Good detection located near the outer edge of detector or near the support structure of the detector ("ribs") at offaxis > 20 arcmin radius. |
| 9 | - | Good detection. This quality flag is used to indicate that the thumbnails have not an optimized rebinning for the source strength and the source appeared split with a separation of about 10 arcsec, well inside the 80% HPD of the PSF. These sources are mostly at large offaxis and low rate (< 1e-2 count/s). |
| 8 | The source detections in the entire field are secure as a whole. But the individual sources are not inspected. | Good detection.This quality flag is used to indicate that the thumbnails have not an optimized rebinning for the source strength and the source appeared split with a separation less 5 arcsec, well inside the 80% HPD of the PSF. These sources are mostly at small offaxis and low rate (< 1e-2 count/s). |
| 7 | - | Good detection, but is located within bright background due to extended emission such as clusters, supernova remnants or near bright X-ray binaries. |
| 6 | - | The point source detection is good but it is weak source. |
| 5 | The source detection is suspicious due to the existence of bright emission features such as clusters, SNRs etc. in the field of view | The source detection is good, but it may be extended or elongated. |
| 4 | Many (typically more than a half) of the detections are caused by extended emission,but there are still good sources | The detections are spurious due to nearby bright sources and also located at (or near) the inner ring, the edge or the ribs of the detector |
| 3 | The source looks perfectly good but is really bad. This may result from a local arc in the detector caused by a temporary HV breakdown or by a mystery pointing that interrupt the sequence | Although the source looks good, it is not a real detection. This may result from a local arc in the detector caused by a temporary HV breakdown or by mystery pointings that interrupts the sequence. This flag also used as the indicator for Supernova remnants that are extended over the field. |
| 2 | The observation was taken within the first 2 months of the mission (June - July 1990) where the processing and satellite were unstable | The observation was taken within the first 2 months of the mission (June-July 1990) where the processing and satellite were unstable. One of all double-counted sources detected in between "in", "in2" and "out" regions and duplicate sequences is suppressed by assigning QFlag=2. |
| 1 | Most of the detections in the field are spurious because of a large extended object | The source detection is false caused by spurious detections due to extended emission from bright Supernova remnant or Low Mass X-ray Binary in the field |
| 0 | - | Same as QFLAG 1, but the spurious detections are caused by clusters |