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:
FileName Lrecl Records Explanations
ReadMe 80 . This file merlin.dat 369 3839 Log of MERLIN archive data
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
Bytes Format Units Label Explanations
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.
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).
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
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