The online interface to the Atacama Pathfinder Experiment (APEX) LABOCA and SABOCA calibration data has been significantly updated. The query pages for zenith opacities and calibration factors are affected. The calibration dataset has been fully re-reduced for both bolometer cameras, leading to improvements and using more precise algorithms to better estimate the sky opacity values. Extensive help pages have been added, including descriptions on how to use these data in BoA.
APEX LABOCA and SABOCA Calibration Data
Published: 20 Jan 2014
Calibration data web interfaces are available for LABOCA and SABOCA. An important change regarding SABOCA concerns the absolute calibration factor (VtoJy), which has been found to show variations with time; tabulation of VtoJy as a function of time is available on the SABOCA calibration page, as well as newly determined expected fluxes for secondary calibrators. An updated version of the SABOCA reduction helper functions, including one to apply the correct VtoJy depending on the time of observation, are available for download. PIs who obtained SABOCA data in the past are strongly encouraged to download and use these functions.
A presentation entitled "APEX Calibration Plan", presented by Felipe Mac-Auliffe at the "Science with the Atacama Pathfinder Experiment (APEX)" meeting, held in Schloss Ringberg, Germany, 20-22 January 2014 is also available.