lbcs_stats.head

#********** LBCS CATALOGUE (PRELIMINARY VERSION) **********
#
#This is the current catalogue of the LBCS project, which is searching for
#long-baseline calibrators for LOFAR. This is done by snapshot observations
#with 30 beams, for 3 minutes each. Fringe solutions are sought for the 
#international array with the phased superterp; a source is currently 
#classified as a "good" calibrator to a given station based on the dispersion
#in short-period delay/phase solutions (this is the quantity which agrees best 
#with the goodness determined by eye in a subset of the data).
#
#If you use the data, please reference the paper: Jackson et al.2016,AA 595,86.
#
#Format of the catalogue:
#
#1) Observation number
#2) RA of the pointing (in most cases determined from the WENSS catalogue,
#   from which the sources are mainly selected)
#3) Dec
#4) and 5) Observation date and time
#6) Goodness of the calibrator on the nine international stations:
#   DE601 Effelsberg
#   DE602 Unterweilenbach
#   DE603 Tautenberg
#   DE604 Potsdam
#   DE605 Juelich
#   FR606 Nancay
#   SE607 Onsala
#   UK608 Chilbolton
#   DE609 Norderstedt
#   PL610 Borowiec
#   PL611 Lazy
#   PL612 Baldy
#   IE613 Birr
#   where "P" means a clear detection of fringes, "S" a marginal detection,
#   "X" no detection, and "-" problems with the antenna.
#7) Quality of the observation, judged by the percentage of source detections
#   on the shorter baselines. Above 20 is probably fine, below 10 is almost
#   certainly a bad observation.
#
#In general: if a source is detected, it is almost certainly OK as a calibrator 
#                to that station
#            if a source is not detected in a "good" observation it is probably
#                not OK, but this is not guaranteed
#            if a source is not detected in a "dodgy" or poor observations it ma#
#                or may not be OK. We are working on these cases
#            many sources are OK on short baselines (601,605,609) but not on 
#                others indicating they are resolved
#            if in doubt you may want to look at the PNG file of the observation
#                (which shows the Fourier transform of the data) and the 
#                composite fringe-rate and delay map of the field. These will
#                appear in the database shortly.
#
# You can make a zoomable plot of these sources with the script
# www.jb.man.ac.uk/~njj/lobos_stats.public.py . Green, yellow, orange blobs
# are calibrators with variable degrees of confidence and/or resolution;
# blue crosses are non-calibrators, magenta and red are non-calibrators but
# in areas of poor quality observations. These cluster around CygA and CasA
# which is probably not a coincidence.
#
#******************************************************************************