NIRSpec Technical Notes
The NIRSpec Technical Reports (NTR) included on this page cover issues related to the JWST/NIRSpec testing, data processing, and other generic topics. Science performances are described in NIRSpec Performance Reports available here. Documents listed in this page do not contain ITAR restricted or proprietary information. Some of the documents are protected and not accessible outside the NIRSpec team.
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TITLE: |
An introduction to the IFU coordinate transforms in the context of the NIRSpec parametric model |
| AUTHORS: |
Giovanna Giardino |
| NTN-2014-005 |
TITLE: |
Geometrical transforms for NIRSpec target acquisition |
| AUTHORS: |
G. Giardino, P. Ferruit, C. Alves de Oliveira |
| ABSTRACT: |
In this note we describe the geometrical transforms and the algorithm to be used to compute the sky coordinates of a given point in the NIRSpec focal plane, in the context of NIRSpec on-board target acquisition operations. |
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| NTN-2014-004 |
TITLE: |
Algorithm to compute the unrectified 2D spectrum for NIRSpec fixed-slits |
| AUTHORS: |
C. Alves de Oliveira, G. Giardino |
| ABSTRACT: |
This note describes the algorithm to compute the unrectified 2D spectrum for the NIRSpec fixed-slits, including the 2D subwindow extraction, and the mapping of the wavelength and spatial coordinates for each pixel in the spectrum. The algorithm is based on the one implemented in the NIRSpec IPS (instrument performance simulator) Pipeline Software (NIPS) used by the NIRSpec Science Operations team at ESA to analyse the IPS simulations and data acquired during NIRSpec calibration tests. [Restricted - Request access] |
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| NTN-2014-003 |
TITLE: |
Assessing the impcat of performing no master bias subtraction when using the current linearity correction files |
| AUTHORS: |
S.Birkmann |
| ABSTRACT: |
In this document we assess the impact of using the current STScI pre-processing approach with the delivered NIRSpec linearity correction files both on the count rate and signal to noise. We find that the derived count rates are higher than with the SOT pre-processing approach, due to the over correction of the detector non linearity, and that the achieved signal to noise is slightly smaller, probably due to the impact of the non corrected pedestal in the STScI approach. [Restricted - Request access] |
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| NTN-2014-002 |
TITLE: |
Computation of the quantum Yield Correction |
| AUTHORS: |
P. Ferruit |
| ABSTRACT: |
We discuss the computation of the quantum yield correction for the two SCAs (selected in December 2013 for integration in the new flight FPA 106). [Restricted - Request access] |
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| NTN-2014-001 |
TITLE: |
MSA reconfigurations during ISIM CV3 and OTIS testing |
| AUTHORS: |
S.Birkmann |
| ABSTRACT: |
In this document we estimate the number of MSA reconfigurations during ISIM CV3 testing at Goddard and OTIS testing and Johnson. The proposed allocation of MSA reconfigurations for these tests is 630. |
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| NTN-2013-016 |
TITLE: |
Preliminary report on the instability of channel drift in FPA104. |
| AUTHORS: |
M. Sirianni, C. Alves de Oliveira |
| ABSTRACT: |
We present the analysis of the instaility of the channel drift in FPA104 and its correlation with the ASIC DSUB current levels. |
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| NTN-2013-015 |
TITLE: |
Analysis in support to NCR1602- ASIC microcode 7 troubleshooting. |
| AUTHORS: |
M. Sirianni |
| ABSTRACT: |
We present a preliminary analysis of the different performance of the NIRSpec DS during the calibration campaign FM2-B with two different versions of the ASIC microcode. [Restricted - Request access] |
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| NTN-2013-014 |
TITLE: |
The spectral irradiance of the MSA glow source |
| AUTHORS: |
P. Ferruit, G.Giardino |
| ABSTRACT: |
We use measurements obtained during NIRSpec's FM2 cycle-1 test campaign to derive a first order estimate of the spectral intensity of the some MSA glow sources. |
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| NTN-2013-012 |
TITLE: |
NIRSpec Reference Fils Data Package - Delivery 1 |
| AUTHORS: |
M. Sirianni |
| ABSTRACT: |
This is the Cover document for the formal delivery to STScI of the DRD GSW-02 "Reference files for data processing" |
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| NTN-2013-011 |
TITLE: |
An introduction to the NIRSpec parametric model |
| AUTHORS: |
G. Giardino |
| ABSTRACT: |
This note provides a brief overview of the NIRSpec parametric model and a help to navigate existing documentations |
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| NTN-2013-010 |
TITLE: |
NIRSpec Mask Reference file for FPA104 |
| AUTHORS: |
G. Giardino, M. Sirianni |
| ABSTRACT: |
This document provides an overview of the structure and content of the NIRSpec reference files of type "mask" for FPA104 that are used by the data processing pipeline to flag static bad pixels |
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| NTN-2013-009 |
TITLE: |
Observations acquired during NIRSpec's ground calibration to validate the on-board scripts for target acquisition |
| AUTHORS: |
G. De Marchi, T. Böker |
| ABSTRACT: |
This note describes the observations collected during the second NIRSpec ground calibration campaign in order to validate the effectiveness of the on-board scripts for target acquisition. |
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| NTN-2013-008 |
TITLE: |
Aperture position in SLIT/MOS imaging mode |
| AUTHORS: |
P. Ferruit |
| ABSTRACT: |
We provide a description of the tables containing the positions of NIRSpec apertures in various image planes and in imaging mode |
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| NTN-2013-007 |
TITLE: |
Data product specification of NIRSpec Reference files for 'Ramps-to-slopes' processing |
| AUTHORS: |
G.Giardino |
| ABSTRACT: |
This document provides an overview of the structure and content of the reference files that are needed to derive count-rate images from NIRSpec raw data cubes - an operations often referred as 'ramps-to-slopes' processing |
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| NTN-2013-006 |
TITLE: |
Monitoring of closed micro shutters during NASA MSA test |
| AUTHORS: |
G.Giardino |
| ABSTRACT: |
During Cycle 2 of the Performance Verification and Calibration campaign (CPV) of NIRSpec flight module 2 (FM2), NASA MSA team performed a series of tests of NIRSpec micro shutter array (MSA) in secondary park position. In this note we provide a summary of the monitoring of the number of closed micro shutters during these test sequences. |
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| NTN-2013-005 |
TITLE: |
FPA104 Gain maps and Amplifier reference files |
| AUTHORS: |
M. Sirianni, S. Birkmann |
| ABSTRACT: |
This document describes the format and content of the amplifier reference files used by the STScI ramp-to-slope pipeline and of the gain maps for FPA104. The data and algorithm used to create the reference files are also described |
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| NTN-2013-004 |
TITLE: |
Description of the NIRSpec linearity correction reference files |
| AUTHORS: |
S. Birkmann |
| ABSTRACT: |
This document describes the format of and the data and algorithms used to create the NIRSpec linearity correction reference files that are input for the STScI ramps-to-slopes pipeline. |
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| NTN-2013-003 |
TITLE: |
Description of the NIRSpec bias and dark reference files |
| AUTHORS: |
S. Birkmann |
| ABSTRACT: |
This document describes the format of and the data and algorithms used to create the NIRSpec bias and dark reference files that are input for the STScI ramps-to-slopes pipeline. |
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| NTN-2013-002 |
TITLE: |
Name and purpose of selected MSA configurations |
| AUTHORS: |
G.De Marchi |
| ABSTRACT: |
This memo provides a list of the names and purposes of selected MSA configurations used during the second NIRSpec thermal vacuum calibration campaign, carried out in 2013 January and February |
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| NTN-2013-001 |
TITLE: |
The JWST phyton tools and library |
| AUTHORS: |
P. Ferruit |
| ABSTRACT: |
We provide a brief overview of the new structure of the JWST python tools and library as well as an updated set of instructions to properly configure your environment |
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| NTN-2012-011 |
TITLE: |
PREP-DET-CHECK: Data analysis and result evaluation |
| AUTHORS: |
M. Sirianni |
| ABSTRACT: |
This brief technical note will guide the reader through the step necessary for the analysis of the data acquired with the PREP-DET-CHECK procedure during the TV2 NIRSpec campaign. It also provides figures, plots and statistics to compare the results with the performance measured during DCL and TV1 testing. |
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| NTN-2012-010 |
TITLE: |
NIRSpec ASIC Configration and Reset type in Full frame, window and stripe mode. |
| AUTHORS: |
M. Sirianni |
| ABSTRACT: |
This short technical notes summarizes the default reading/clocking mode configuration for the NIRSpec Detector System - Restricted access. |
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| NTN-2012-009 |
TITLE: |
NIRSpec FM Campaign – Science Support mini HOW-TO. |
| AUTHORS: |
M. Sirianni |
| ABSTRACT: |
Instructions for HW and SW setup up for the ESA quick look workstations - Restricted access. |
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| NTN-2012-008 |
TITLE: |
The radiometric stability of the RCSS based on telemetry data |
| AUTHORS: |
S. Birkmann |
| ABSTRACT: |
This document assesses the radiometric stability of the RCSS based on cycle 1 telemetry data. We briefly describe the format of the used telemetry data and its origin. We find that, integrated over the ∼1 to ∼1.9 μm wavelength range, the RCSS is stable to 10−3 on time scales of hours. Furthermore, the observed drifts can be well modeled by an exponential function with root mean square residuals typically better than 10−4. Based on the findings in this note we recommend to use the high resolution Band I grating with the RCSS IFS3_N source for the simulation of exoplanet transit observations. |
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| NTN-2012-006 |
TITLE: |
Documentation for sb_cmo_offset.pro |
| AUTHORS: |
S. Birkmann |
| ABSTRACT: |
This document describes the purpose and usage of the sb cmo offset.pro procedure. We also list the prerequisites necessary to run the program and provide a listing of its arguments and keywords. |
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| NTN-2012-004 |
TITLE: |
Documentation for MSA-detect tool |
| AUTHORS: |
G. Giardino |
| ABSTRACT: |
In this note we give a brief introduction to the software tool MSA-detect. The main purpose of this tool is to derive the mapping betwen each MSA micro-shutter and the position of its image (when illuminated in imaging mode) onto the detector, in pixel coordinates. This mapping can then be used to identify failed or partially-failed open shutters in MSA all-closed exposures and closed shutters in all-open exposures. |
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| NTN-2012-003 |
TITLE: |
Documentation for sb_distortion.pro |
| AUTHORS: |
S. Birkmann |
| ABSTRACT: |
This document describes the purpose and usage of the sb distortion.pro procedure. We also list the prerequisites necessary to run the program and provide a listing of its arguments and keywords. |
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| NTN-2012-002 |
TITLE: |
Documentation for sb_derive_focus.pro |
| AUTHORS: |
S. Birkmann |
| ABSTRACT: |
This document describes the purpose and usage of the sb derive focus.pro procedure. We also list the prerequisites necessary to run the program and provide a listing of its arguments and keywords. |
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| NTN-2012-001 |
TITLE: |
Documentation for check_subarrays.pro |
| AUTHORS: |
S. Birkmann |
| ABSTRACT: |
This document describes the purpose and usage of the check_subarrays.pro procedure. We also list the prerequisites necessary to run the program and provide a listing of its arguments and keywords. |
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| NTN-2011-008 |
TITLE: |
JWST/NIRSpec SKY to MSA coordinate transform |
| AUTHORS: |
P. Ferruit |
| ABSTRACT: |
We have generated a polynomial fit of the SKY to MSA coordinate transform and this technical note provides a description of this coordinate transform model and of the associated file (PCF format). |
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| NTN-2011-007 |
TITLE: |
Installing the NIRSpec Calibration Software and Database on Mac OS X 10.7 (Lion) |
| AUTHORS: |
S. Birkmann |
| ABSTRACT: |
This document describes the necessary steps to install the NIRSpec Calibration Software and Database on a "fresh" Mac OS X 10.7 (Lion) system. |
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| NTN-2011-006 |
TITLE: |
Features and Anomalies in Cycle-1 Data |
| AUTHORS: |
M. Sirianni and the SOT |
| ABSTRACT: |
We present some of the features and anomalies encountered so far in cycle-1 data. |
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| NTN-2011-005 |
TITLE: |
NIRSpec Reference Files and Data Quality Flags |
| AUTHORS: |
G. Giardino, S.Birkmann, M. Sirianni |
| ABSTRACT: |
This report provides an overview of the structure and content of the reference files and data quality flags used by the NIRSpec pipeline (version 0.33). A more detailed characterization of the data content of these reference files for each FPA and operational temperature will be provided in a separate document at the completion of the analysis of the data. |
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| NTN-2011-004 |
TITLE: |
Description of the NIRSpec pre-processing pipeline |
| AUTHORS: |
S. Birkmann |
| ABSTRACT: |
In this document we describe how to run the NIRSpec pre-processing pipeline, the processing steps performed, and the format of the data written out by it. |
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| NTN-2011-003 |
TITLE: |
NIRSpec Archive and Database |
| AUTHORS: |
G.Giardino, M. Sirianni |
| ABSTRACT: |
This document provides a description of the structure of the NIRSpec data archive and the database. For the database, a brief description of its user interface is also given. |
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| NTN-2011-002 |
TITLE: |
Description of the NIRSpec OGSE |
| AUTHORS: |
S. Birkmann |
| ABSTRACT: |
In this document we describe the NIRSpec OGSE available during the instrument level calibration campaigns. |
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| NTN-2011-001 |
TITLE: |
Overview of the NIRSpec first cryogenic test campaign |
| AUTHORS: |
P. Ferruit |
| ABSTRACT: |
This report provides an overview of the timeline and contents of the first cryogenic campaign of the JWST/NIRSpec instrument that took place from the end of January 2011 to the beginning of March 2011. An extensive list is given in this excel file. |
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