B/merlin The MERLIN Archive (MERLIN 1992-)
The MERLIN Achive
MERLIN Staff
<MERLIN/VLBI National Facility, JBO, University of Manchester, UK. (1992-)>
ADC_Keywords: Observatory log ; Radio sources
Description:
This database contains a log of MERLIN archive data since 1992 which
have been partially reduced and are electronically available. It is
managed and updated by the MERLIN staff. All data are taken using a
single IF and correlated using 2-bit digitisation.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
merlin.dat 369 3839 Log of MERLIN archive data
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See also:
http://www.merlin.ac.uk/archive/ : for more information and for the
full list of sources observed but not yet electronically archived.
Byte-by-byte Description of file: merlin.dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh Pointing position R.A. J2000 (hr)
4- 5 I2 min RAm Pointing position R.A. J2000 (min)
7- 15 F9.6 s RAs Pointing position R.A. J2000 (sec)
17 A1 --- DE- Pointing position Dec. J2000 (sign)
18- 19 I2 deg DEd Pointing position Dec. J2000 (degrees)
21- 22 I2 arcmin DEm Pointing position Dec. J2000 (arcmin)
24- 31 F8.5 arcsec DEs Pointing position Dec. J2000 (arcsec)
33- 49 A17 --- Name Source name
51- 68 A18 --- Observ Observatory Name
70- 87 A18 --- Station Antennas potentially present (1)
89- 98 A10 --- DataID Data processing block ID
100-103 I4 yr begDATE.Y Block start date (year) (2)
104-105 I2 "month" begDATE.M Block start date (month) (2)
106-107 I2 d begDATE.D Block start date (day) (2)
109-112 I4 yr endDATE.Y Block end date (year) (2)
113-114 I2 "month" endDATE.M Block end date (month) (2)
115-116 I2 d endDATE.D Block end date (day) (2)
118-127 F10.3 MHz Freq Frequency in central channel (3)
129-136 F8.6 MHz Chanwidth Channel width in raw data
138-143 F6.3 MHz Bandwidth Bandwidth of raw data
145-152 A8 --- Stokes Polarisation products potentially available
154-159 F6.4 mas pixRA Pixel size in R.A. direction (4)
161-166 F6.4 mas pixDE Pixel size in Dec. direction (4)
168-175 I8 --- Nvisib Number of visibilities on source
177-184 A8 --- Type Source type (5)
186-202 A17 --- Assoc Associated source(5)
204-210 A7 --- AssocType Associated source type (5)
212-224 A13 --- AMPCAL Amplitude calibration source
226-234 F9.3 Jy AmpFlux Flux density assigned to AMPCAL (6)
236-247 A12 --- PropID Proposal code
249-278 A30 --- PIname Principle Investigator
280-359 A80 --- Comments Factors affecting data quality
361-369 I9 --- DataNo Link to MERLIN Archive web page
for more details.
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Note (1): Two-letter codes for antennas present for all or part of the block.
Note (2): Each source was observed for one or more periods during this block.
Note (3): If the LSR correction is applied FREQ is in the source rest-frame.
Note (4): The pixel size is chosen during mapping and can be changed.
Resolution is determined by the beam size and signal-to-noise ratio.
Note (5): Source type can be
TARGET,
PHICAL (phase calibration source),
TARX (non-phase-referenced target),
AMPCAL (amplitude calibration source),
POLCAL (polarisation calibration source) or
PACAL (polarisation angle calibration source).
Note (6): The AMPCAL flux on MERLIN scales is derived wrt 3C286 (Baars 1977).
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History:
This file is updated as more MERLIN archive data becomes available on-line.
Acknowledgements:
We warmly thank the CDS staff for assistance in making these data accessible.
(End) Anita M. S. Richards [JBO] 14-Oct-2002