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Procedure:
 Standard Calibration OBs for the NTT
Author:
 Olivier R. Hainaut
Doc:
 LSO-MAN-ESO-40610-0002
Release:
 1.0/1998-Dec-24
 

1. Introduction

In the framework of the NTT Calibration Plan, The NTT Team has prepared a list of OBs to be used to calibrate all the "standard observing modes". This document describes these OBs and how to use them.
 

1.1 Standard Observing Modes

The NTT instruments allow observations to be performed in an infinity of different modes; it is unfortunately impossible to give standard calibrations for all of them. A set of commonly used observation modes ("Standard Modes") have been identified, and OBs have been written to fully calibrate them. A larger set ("Extended Modes") have an incomplete set of OBs.  In the list below, the Standard Mode Calibrations are identified by a name starting with CalPlan.

The calibration OBs include night time calibration, e.g. photometric field and spectrophotometric star observations, and ancillary, or day time calibration, like biases, flatfields, HeAr...

While preparing an observing program, the observer can either use the standard OBs directly, if his program is compatible with the standard or extended observing modes, or modify them to his taste.

1.2 Available OBs

1.2 Procedure to use the Std Calibration OBs

In addition to the calibrations that the observer performs himself, the observer can request up to 2h of day-time calibrations that will be performed for him by the NTT staff. To request these day-time calibrations, the observer should fill out the "Day-Time Calibration Request Form" available at the control room.

The Standard Mode Calibrations are requested by checking boxes on the form (in the list below, the Standard Mode OBs are identified by their name starting with CalPlan). Additional OBs, either of an extended mode or prepared by the observer, can be requested by filling a list of OBs on the form.

To use the Calibration OBs yourself (e.g. photometric standard), proceed as following from P2PP:

use the OBs as any other OBs; in BOB, you will have to select relevant templates (e.g. for the spectrophotometric standard OBs, select only the template with the relevant Grism).
 
Notes:

2. Description of the OBs

2.1 Night-Time OBs

A set of OBs for photometric star and spectrophotometric field observations has been defined, and is described in the following documents:

2.2 Ancillary Calibrations

A. EMMI

A.1. Bias and Darks

in the following modes: OBs:
CalPlan_EMMI_Biases_Blue_Fast.obx
CalPlan_EMMI_Biases_Blue_Slow.obx
CalPlan_EMMI_Biases_DIMD_Fast.obx
CalPlan_EMMI_Biases_DIMD_Slow.obx
CalPlan_EMMI_Biases_Red_Fast.obx
CalPlan_EMMI_Biases_Red_Slow.obx
CalPlan_EMMI_Daily_Biases_Normal.obx

CalPlan_EMMI_Dark_Blue_Fast.obx
CalPlan_EMMI_Dark_Blue_Normal.obx
CalPlan_EMMI_Dark_Blue_Slow.obx
CalPlan_EMMI_Dark_Red_Fast.obx
CalPlan_EMMI_Dark_Red_Normal.obx
CalPlan_EMMI_Dark_Red_Slow.obx

A.2 Flat Fields/Imaging

3x Flat-Field, level set to 20000adu, in the Following combinations of modes: OBs:
CalPlan_EMMI_ImFlats_Blue_Fast.obx
CalPlan_EMMI_ImFlats_Blue_Normal.obx
CalPlan_EMMI_ImFlats_Blue_Slow.obx
CalPlan_EMMI_ImFlats_Red1_Fast.obx   (Bb, V, R, I, Z)
CalPlan_EMMI_ImFlats_Red1_Normal.obx
CalPlan_EMMI_ImFlats_Red1_Slow.obx
CalPlan_EMMI_ImFlats_Red2_Fast.obx  (g, r, i, z)
CalPlan_EMMI_ImFlats_Red2_Normal.obx
CalPlan_EMMI_ImFlats_Red2_Slow.obx
 

A.3 Flat-fields/Spectroscopy

Currently available only for Grism (RILD) spectroscopy

3x Spectro FF, level set to 20000adu, in the following combinations of modes:

OBs:
CalPlan_EMMI_LD_SpFlats_Fast_1.obx      slit of 1", all grisms
CalPlan_EMMI_LD_SpFlats_Normal_1.obx
CalPlan_EMMI_LD_SpFlats_Slow_1.obx
CalPlan_EMMI_LD_SpFlats_Fast_5.obx     slit of 5", all grisms
CalPlan_EMMI_LD_SpFlats_Normal_5.obx
CalPlan_EMMI_LD_SpFlats_Slow_5.obx
 
 

A.4 Wavelength calibration

One lamp calibration, exposure time is set properly to get the lines well exposed, in the following modes

B. SuSI-2

B.1. Biases and Darks

9x 0sec bias or 3x 1200s Darks,  full CCD mosaic, bin 2x2

B.2 Imaging FF

3x Dome flat-field, level set to 20000adu, full CCD mosaic, bin 2x2, filters U, B, V, R, I, Z, r
--oOo--
 
 

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