filename: flags.sum
Date: 23 Sep 95
originat: wnp/deh
tlm: 1 Mar 95
Subject: OVERVIEW OF THE QUALITY CONTROL FLAGS FOR THE ROSAT RESULTS ARCHIVE
This summary of all flags is based on the original plan from the Sept
94 meeting at MPE. It has been updated to reflect changes agreed upon
at the Feb 95 meeting. Source flags use lower case letters; Field
flags are upper case. A flag has the value f (false) if the parameter
is ok; or t (true) if the parameter is wrong or suspect. Most, but not
all, flags apply to both PSPC and HRI, although occasionally the
precise definition is somewhat different. The column 'VI' means
'visual inspection'.
4 OCT 94 - 'u' flag added by deh for HRI
1 MAR 95 - delete O field flag; change P to S; add 'a' flag.
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Notes:
VI visual inspection
Flags are all T/F (not qualitative flags);
Flags are warnings about reliability of parameters &/or presented errors;
Flags are NOT definitive statements about source reliability.
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In addition new PSPC parameter per source: varnew_ind variability indicator
pos_err_map position error for map detect sources
ROSAT_name ROSAT source designation (1sx.1' accuracy)
comment comment
In addition new parameters per sequence: flg_stat number of source flags set of each type
num_src number of detected sources by SASS
bkg_stat total time in 4 (tbd) background levels
bkg_levs lower boundary of background levels
QC_site site of quality control
QC_date date of quality control
QC_SYS version nr. of quality control software
QC_person person responsible for quality control
comment line
missed_tab table of missed source(s), positions, etc.
Source Flags
============
Letter Name PSPC Description PSPC Genesis VI HRI Description HRI Genesis
------ ---- ---------------- ------------ -- --------------- -----------
a assoc_nn associated w. algorithm; extent nn associated with algorithm:
nearest neighbor PRF(E,theta) any source in field PRF(theta), REC
c confused close sources visual inspection yy close sources visual inspection
confounded detect confounded detect
d det_struct source near rib compare psf with nn source near outer edge taken from edge
rib and edge distance proximity indicator
e extended source extended from extent size and nn source may be larger SIZCOR > 1.2
extent likelihood psf
f false_det source reality visual overlay yy source reality visual overlay
doubtful doubtful
i Inten_susp intensity values flag if confused, nn all intensity flag if extended
may be suspect mult_det, det_struct values may be suspect or det_struct set
or within_ext set or A,a,c,w
l ltc_susp lightcurve from extraction n
extraction may radius and nearest
be incorrect source distance
due to nearby
source contamin.
or detect_struc.
m mult_det complex emission visual inspection yy complex or strong visual inspection
split into individual emission produced
sources multiple detections
of a single source
n not_checked no visual inspection ML<15, or D set nn source not flag if unexamined source
examined for set if S/N < threshold
reliability set if field deferred (D)
p pos_susp possible problem with overlay of derived yy possible problem with 1) overlay of derived
position determination sources on image position determination sources on image;
s spec_susp raw spectrum for compare bg extract n
spectral fits suspect radius with nearest
source
u un_uniq n source is not unique if there is a matched
detection made with a
smaller detect cell
v varflg_susp - - n believability of compare variability flag
variability flag of source and background
w within_ext believable source visual inspection yy believable source visual inspection
embedded in extended embedded in extended
emission emission
FIELD/SEQUENCE FLAGS
====================
Letter Name PSPC Description PSPC Genesis VI HRI Description HRI Genesis
------ ---- ---------------- ------------ -- --------------- -----------
A asp_susp aspect solution ? yy aspect solution inner sources look
may be in error may be in error oval
B bkg_susp wrong BG image ? nn High BG or other extended emission flag
or Av BG > level 8
D deferred peculiarities to yy peculiarities to
be dealt with later be dealt with later
E ext_emis may affect sources visual inspection of yy may affect sources visual inspection
&/or bgd image &/or bgd of image
F fals_det presence of possibly f source flag set for nn presence of possibly f source flag set for
spurious sources in 1 or more sources spurious sources in 1 or more sources
image image
M src_mis probable sources visual inspection of yy probable sources visual inspection of
missed by detect source overlay missed by detect source overlay
O other other problems not yy other problems not
classified were classified were
found found
S slist_mis source list check of empty or nn source list check of empty or
missing or empty missing files missing or empty missing files
HEASARC Staff Scientist Position - Applications are now being accepted for a Staff Scientist with significant experience and interest in the technical aspects of astrophysics research, to work in the High Energy Astrophysics Science Archive Research Center (HEASARC) at NASA Goddard Space Flight Center (GSFC) in Greenbelt, MD. Refer to the AAS Job register for full details.
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