ISAAC: reduction of calibration data

ISAAC data reduction:
calibrations burst mode

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LW-arm darks in BURST or FastJitter (HIT) mode

This mode is offered since P79 (April 2007). There is no pipeline support for the BURST and FastJitter mode.

Darks of the Aladdin detector for BURST and FastJitter mode have a different frame and file format with respect to spectroscopy and imaging mode. In the following table we list the relevant detector keys to classify the types of dark frames:

mode	DET.WIN.TYPE	DET.FRAM.TYPE	comment
NORMAL	0	INT	LW-arm imaging and spectroscopy modes.The raw frame is a two-dimensional image.
WINDOW	1	INT	window read out frame. The size of the frame in pixel is given by DET.WIN.NX and DET.WIN.NY, both values are smaller than 1024. The raw frame is a two-dimensional image.The darks taken in this mode are used to calibrate twilight flats taken in BURST and FastJitter mode.
BURST	1	SAMPLE	The raw frame is a data cube of size DET.WIN.NX * DET.WIN.NY * NAXIS3, where *NAXIS3 = 2 DET.NDIT**. The darks taken in this mode are used to calibrate science data cubes taken in BURST mode.
FASTJITTER	1	DIT	The raw frame is a data cube of size of DET.WIN.NX * DET.WIN.NY * NAXIS3, where NAXIS3 = DET.NDIT. The darks taken in this mode are used to calibrate science data cubes taken in FastJitter mode.

The detector read out mode DET.MODE.NAME = DoubleCorrLowBias for modes WINDOW, FastJitter and BURST.

darks of type NORMAL and WINDOW can be submitted to the isaac dark recipe. These two types of raw frames are supported by the pipeline as the raw frames are two-dimensional FITS images.

LW-arm window read out pipeline product frame of 62x200 pixel in DoubleCorrLowBias read mode and DIT=2.0 sec

Purpose:Dark current to be subtracted from each plane of the window sky flats and window science frames

Recipe: the dark recipe does not support processing of darks taken in HIT and BURST mode.

LW-arm twilight flats BURST and FastJitter (HIT) mode

Window read out sky flats (= twilight flats taken with the skyflat template) can be distinguished from full detector twilight flats by the header key DET.WIN.TYPE that is 1 in the window read out case. Raw window SKY flats have DET.FRAM.TYPE="INT", meaning they come as a stack of single imaging frames (no data cubes). They can be submitted to the isaac twilight recipe in the same way as full-detector twilight raw frames. A master dark of the same window size can be submitted in addition.

LW-arm raw twilight flat with 62x200 pixel, H-band, in DoubleCorrLowBias read mode.

LW-arm pipeline product MASTER_IMG_FLAT with 62x200 pixel, H-band, in DoubleCorrLowBias read mode.

LW-arm pipeline product error map with 62x200 pixel, H-band, in DoubleCorrLowBias read mode.

LW-arm pipeline product bad pixel map with 62x200 pixel, H-band, in DoubleCorrLowBias read mode.

LW-arm pipeline product interception frame with 62x200 pixel, H-band, in DoubleCorrLowBias read mode.

Purpose. The window read mode twilight flats are to

Recipe. The isaac twilight flat recipe can be used to reduce window SKY flats. See data reduction of LW-arm twilight flats for details.