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arfgen (arfgen-1.102) [xmmsas_20211130_0941-20.0.0]


This section documents warnings and errors generated by this task (if any). Note that warnings and errors can also be generated in the SAS infrastructure libraries, in which case they would not be documented here. Refer to the index of all errors and warnings available in the HTML version of the SAS documentation.

 The value of the INSTRUME attribute of the spectral file is not EMOS1, EMOS2 or EPN. (This indicates a bug - raise an SPR)
 The detector map array is not 2-dimensional as expected.
 The number of elements in the computed area vector do not match that in the energy grid. This indicates a bug - raise an SPR.
 The requested X-range for the flat or psf detector map arrays is not such that detxmin $\rm >=$ detxmax. (This indicates a bug, so an SPR should be raised).
 The requested Y-range for the flat or psf detector map arrays is not such that detymin $\rm >=$ detymax. (This indicates a bug, so an SPR should be raised).
 The number of pixels specified for the flat or psf detector maps is zero (This indicates a bug, so an SPR should be raised).
 The source does not lie within the region corresponding to that of the detector map.
 The value of the parameter sourcecoords is not a valid type (this indicates a bug - raise an SPR)
 There are no patterns in the internal list (this indicates a bug - raise an SPR.)
 The detector map array WCS axis types were not DETX and DETY.
 The input spectrum does not contain a mandatory data subspace component. Arfgen needs this information to determine the position of the source on the detector among other things. Ensure that the writedss option is set true within the evselect parameters
 The data subspace in the input spectrum either doesn't contain region information or it is unbounded in detector coordinates.
 The data subspace contains a shape which is not recognised by arfgen
 The rmf file specified doesn't contain an RMF table from which the energies can be extracted
 An error has occurred within arfgen which is not understood. The most likely reason is that the software environment or the input datafile is corrupt in some way. Try redefining the SAS environment, including CCF directories and regenerate the spectrum.
 The Filter keyword in the spectrum header is either missing or doesn't match a known filter
 The detector map image given by the parameter detmaparray does not include the spatial region used to extract the spectrum
 A pixel within the detector map has a negative value.
corrective action: Continue processing - the pixel would provide negative weighting to the total ARF
 The selected regions are unbounded along the positive or negative directions along either the DETX, DETY, X or Y axes.
corrective action: continue
 The extent of the selected region projected along the DETX axis exceeds the detector map bounds for that axis.
corrective action: continue
 The extent of the selected region projected along the DETY axis exceeds the detector map bounds for that axis.
corrective action: continue
 One or more of the global attributes REFXCTYP, REFXCRPX, REFXCRVL, REFXCDLT, REFYCTYP, REFYCRPX, REFYCRVL, REFYCDLT are not present in the spectrum dataset.
corrective action: Provide a dummy WCS setting, for the POS coordinate system and continue. The RA/DEC reference pointing, corresponding to REFXCRVL and REFYCRVL, is instead taken from the attributes RA_PNT and DEC_PNT
 This means that the detector map has all zero elements. The resultant ARF will be full of zeroes. This is unimportant if arfgen has been called from backscale but is a major error if arfgen is being used standalone. If a 'flat' or 'psf' map has been used it may be that more elements are needed to fully describe the source region. An alternative possibility is that the attitude reconstruction is bad for this observation.
corrective action: continue
 Similar to 'zeroSumDetmap' but may mean that no detector map pixels lie within the boundaries of a CCD. This can occur if the backscale calculation is performed on a source region whose centre lies on a chip gap.
corrective action: continue
 The bad pixel file hasn't been specified on the command line or is invalid. This means that no correction for bad pixels will be applied
corrective action: continue
 The circular PSF model is valid for energies upto 9keV for the MOS and 10.5 keV for EPIC-PN. This warning reminds the user that the higher energies in the ARF will be corrected for the encircled energy fraction using the 9keV PSF, which is at best an approximation
corrective action: continue
 This message comes from the CAL package and normally means that the PSF is being evaluated outside its standard range. This is usually harmless
corrective action: continue
 This means that a quantity, usually the PSF, is being evaluated at an off-axis angle outside those at which the quantity has been calibrated. The quantity relevant to the furthest off-axis calibration point is returned.
corrective action: continue
 The input spectrum doesn't contain the pipeline processing version. This means that the s/w doesn't know whether it should apply the out-of-time correction or not. See section 5.11
corrective action: continue without applying out-of-time correction
 The pattern fractions used to scale the detector Quantum Efficiency are defined for a set number of standard pattern ranges (0, 0-4, 1-4, 0-12). The task can not cope with a different pattern range and so defaults to using the full set of patterns
corrective action: assume that the spectrum contains the full range of patterns
 If the spectrum contains an observing mode (in the keyword SUBMODE) which is not recognised then the software assumes that the common PrimeFullWindow mode was in use. The mode is used to calculate certain calibration quantities such as the pattern fractions
corrective action: PrimeFullWindow
 This means that the pattern selection in the input spectrum is not calibrated for the observing mode. e.g. Any pattern selection other than 0-4 will cause this warning to be issued for PN timing mode spectra.
corrective action: recreate the spectrum using the recomended pattern range
 The area of the spatial region (BACKSCAL) has been calculated to be negative. This can happen and usually means that the chosen area has no good pixels due to it being outside the field-of-view or obliterated by bad pixels, bad columns or chip gaps. The program sets the BACKSCAL value to zero in the output file.

XMM-Newton SOC -- 2021-11-30