Faulty LBA tables

Some of the LBA calibration tables installed in the stations in the period between 21st September 2015 and 22nd November 2016 have suffered from format issues that prevented them to be correctly read by the system during observations. This means that at the stations where such faulty tables were installed, data were collected without the application of a calibration table and the delay corrections that it provides. Instead of the table installed, a "default" (empty) table was loaded. It is estimated that on average in LBA one can expect that the lack of a calibration table would turn into a noise up to about 20% larger than with proper calibration. Unfortunately, this cannot be corrected in the data reduction process.

Since the end of November 2016, a new alert system has been implemented to avoid that such a problem may affect again LOFAR data in the future.

Between 19 May 2016 and 22 November 2016, the following stations had unreadable calibration tables in LBA OUTER:

Core Stations: 001, 002, 003, 004, 005, 006, 007, 011, 017, 024, 026, 028, 030, 032, 101, 103, 201, 302, 501, and 401

Remote stations: 210, 306, 307, 310, 406, 503, and 508.


This affected the following projects:
IPS_Commissioning
LC5_001
LC6_001
LC6_002
LC6_007
LC6_008
LC6_010
LC6_019
LC6_023
LC6_027
LC7_009
LT5_009



Between 21 September 2015 and 22 November 2016, station CS013 had an unreadable LBA INNER calibration table.

This affected the following projects:
Commissioning2016 (Total power spectroscopy)
DDT5_002
Hexacopter
LC3_022
LC6_001
MSSS_LBA


The associated observation IDs are given in the following spreadsheets:

LBA INNER missing tables


LBA OUTER missing tables

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