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Hubble Space Telescope
COS Instrument Science Reports

2014

ISR 2014-01: Summary of the Cycle 19 COS Calibration Program

We summarize the Cycle 19 calibration program for the Cosmic Origins Spectrograph (COS) on the Hubble Space Telescope, covering the time period from November 2011 through October 2012. We give an overview of the Calibration Plan and status summaries for each of the individual proposals comprising the C19 Calibration program.
J. Roman-Duval 16 Jul 2014

ISR 2013-09: Updated Absolute Flux Calibration of the COS FUV Modes

We present newly derived point source absolute flux calibrations for the COS FUV modes at both the original and second lifetime positions.
D. Massa 14 Mar 2014

2013

ISR 2013-16: Summary of Results from the First Move to a New COS FUV Lifetime Position

We summarize the results of the enabling and calibration activities involved in the first COS FUV move to a new lifetime position, which occurred on July 23, 2012.
R. Osten 08 Oct 2013

ISR 2013-08: Characterization of the COS FUV Detectors

This document describes the results derived from the COS calibration Program 12676, "COS/FUV Characterization of Detector Effects".
D. Massa 01 Oct 2013

ISR 2013-06: COS FUV Dispersion Solution Verification at the New Lifetime Position

In this report, we describe the analysis we performed to verify the dispersion solutions of the M gratings using data collected in 12805 and of the L grating using data obtained in enabling program 12796 (FENA3:“Second COS FUV Lifetime Position: Focus Sweep Enabling Program”; Oliveira et al. 2013).
P. Sonnentrucker 10 Jun 2013

ISR 2013-07: COS/FUV Spatial and Spectral Resolution at the new Lifetime Position

In this ISR we characterize the spatial and spectral resolution at the second COS FUV lifetime position.
J. Roman-Duval 10 Jun 2013

ISR 2013-05: Second COS FUV Lifetime Position: Verification of FUV Bright Object Aperture (BOA) Operations (FCAL4)

The document describes the analysis of data taken as part of the second lifetime calibration program 12807. This program was designed to characterize the BOA spectroscopic performance at the second lifetime position.
J. H. Debes 22 May 2013

ISR 2013-04: Summary of COS Cycle 18 Calibration Programs

This document summarizes the status of the calibration programs for COS during Cycle 18.
G. Kriss 26 Apr 2013

ISR 2013-03: Second COS FUV Lifetime Position: Verification of Aperture and FUV Spectrum Placement (FENA2)

This document describes the analysis of the data obtained for proposal 12795 which determined the exact updates for the Science Instrument Aperture File (SIAF) and for the COS aperture block positioning needed to implement routine science operations at COS FUV Lifetime Position 2.
C. Proffitt 08 Apr 2013

ISR 2013-02: COS/FUV Mapping of Stray PtNe Lamp Light Through the FCA

This ISR reviews the causes of the shutdown program 12096 and how program 12677 was crafted to avoid a similar shutdown. The document presents results from program 12677 and their impact on future lifetime position is discussed.
C. Oliveira 07 Feb 2013

ISR 2013-01: Second COS FUV Lifetime Position Results from the Focus Sweep Enabling Program, FENA3 (12796)

This document describes the results from the second lifetime position focus sweep with COS/FUV G130M, G160M, and G140L gratings as part of the programs executed to enable COS/FUV science at the second lifetime position.
C. Oliveira 06 Feb 2013

2012

ISR 2012-02: Summary of COS Cycle 17 Calibration Program

This document summarizes the status of the calibration programs for COS during Cycle 17.
R.Osten 29 Nov 2012

ISR 2012-01: COS FUV Focus Determination for the G140L Grating

Describes the procedures for determining the COS FUV fine-focus for the G140L grating.
P. Ghavamian 03 Oct 2012

2011

ISR 2010_11: COS FUV Detector Dark Rates During SMOV and Cycle 17

This ISR describes the behavior and characteristics of the COS FUV detector dark rate during SMOV and Cycle 17.
D. Sahnow 07 Oct 2011

ISR 2011-05: Gain sag in the FUV detector of the Cosmic Origins Spectrograph

SPIE paper describing the characteristics and mitigation strategies of gain sag in the FUV detector.

David J. Sahnow, Cristina Oliveira, Alessandra Aloisi, Philip E. 
Hodge, Derck Massa, Rachel Osten, Charles Proffitt, Azalee 
Bostroem, Jason B. McPhate, Stéphane Béland, Steven N. Osterman 
and Steven V. Penton, "Gain sag in the FUV detector of the Cosmic 
Origins Spectrograph", Proc. SPIE 8145, 81450Q (2011); 
http://dx.doi.org/10.1117/12.893989

Copyright 2011 Society of Photo-Optical Instrumentation Engineers. 
One print or electronic copy may be made for personal use only. 
Systematic reproduction and distribution, duplication of any 
material in this paper for a fee or for commercial purposes, or 
modification of the content of the paper are prohibited.

D. Sahnow 26 Sep 2011

ISR 2011-04: Details of COS TAGFLASH Execution

Describes the characteristics of COS TAGFLASH exposures.
T. Keyes 07 Sep 2011

ISR 2011-03: COS FUV Gridwire Flat Field Template

Results of the FUV Gridwire Flat Field Development and Testing.
J. Ely 05 Aug 2011

ISR 2011-02: Updated Results from the COS Spectroscopic Sensitivity Monitoring Program

Updated Results from the COS Spectroscopic Sensitivity Monitoring Program.
R. Osten 28 Jun 2011

ISR 2010_12: COS NUV Detector Dark Rates During SMOV and Cycle 17

This ISR describes the behavior and characteristics of the COS NUV detector dark rate during SMOV and Cycle 17.
D. Sahnow 12 Jul 2011

ISR 2010_13: SMOV: COS FUV and NUV On-Orbit Structural and Thermal Stability

This ISR provides a description and analysis of the structural and thermal stability of the COS instrument.
T. Ed Smith 12 Jul 2011

ISR 2011-01: Improved Medium Resolution Line Spread Function for the COS FUV Spectrum

We have developed an improved line spread function (LSF) for the medium resolution far- ultraviolet gratings (G130M and G160M) of the Cosmic Origins Spectrograph (COS) by taking into account scattering in the far wings due to microroughness on the HST primary mirror.
G. Kriss 18 Mar 2011

2010

ISR 2010-10: SMOV: COS NUV Imaging Performance

Presenting data analysis to describe NUV Imaging Performance for COS after SM4. Revised 10/6/2010
P. Goudfrooij 11 Mar 2010

ISR 2010-08: SMOV: COS NUV External Spectroscopic Performance

Describes the external spectroscopic performance of the COS NUV detector
S. Béland 30 Sep 2010

ISR 2010-09: COS FUV External Spectroscopic Performance

A description of the External Spectroscopic Performance of the FUV Channel on COS
P. Ghavamian 30 Sep 2010

ISR 2010-15: Early Results from the COS Spectroscopic Sensitivity Monitoring Programs

We report initial results from the Cosmic Origins Spectrograph spectroscopic sensitivity monitoring calibration programs.
R. Osten 02 Aug 2010

ISR 2010-14: COS Target Acquisition Guidelines, Recommendations, and Interpretation

This ISR provides an overview of COS TA and updates, expands, and supersedes information in the COS IHB(v2)
T. Keyes 15 Jun 2010

ISR 2010-07: SMOV: COS FUV Focus Determination

The procedures for determining the COS FUV fine-focus are described
D. Lennon 04 Mar 2010

ISR 2010-05: SMOV: COS NUV Wavelength Calibration

Update to the NUV wavelength calibration from SMOV
C. Oliveira 19 Feb 2010

ISR 2010-06: SMOV: COS FUV Wavelength Calibration

Update to the FUV wavelength calibration from SMOV data
C. Oliveira 19 Feb 2010

ISR 2010-04: SMOV: COS NUV On-orbit Optical Alignment

SMOV NUV optical alignment process description
G. Hartig 12 Feb 2010

ISR 2010-01: SMOV Absolute Flux Calibration of the COS NUV Modes

Describes the processes used to determine the absolute flux calibration of COS NUV point source spectra
D. Massa 28 Jan 2010

ISR 2010-02: SMOV Absolute Flux Calibration of the COS FUV Modes

Describes the processes used to determine the absolute flux calibration of COS FUV point source spectra
D. Massa 28 Jan 2010

ISR 2010-03: COS Near-UV Flat Fields and High S/N Determination from SMOV Data

Describes the process of determining and results of the COS NUV high S/N flat field reference files from data taken during SMOV4
T. Ake 04 Feb 2010

2009

ISR 2009-01(v1): Preliminary Characterization of the Post-Launch Line Spread Function of COS

Description of the COS Line Spread Function (LSF) as determined by post-launch testing.
P. Ghavamian 01 Oct 2009

2008

COS ISR 08-01: Phase II Update and Guidelines for Cycle 17 Users of COS

Summary of recommended practice and suggestions for observers preparing their Phase II COS program submissions for Cycle 17.
D. Soderblom 06 Jun 2008

2002

COS ISR 02-01: COS Bright Object Protection

COS Bright Object Protection
C. Leitherer 07 Mar 2006

1999

COS ISR 99-01: COS Design Reference Mission and Ground System Volume Requirements

COS Design Reference Mission and Ground System Volume Requirements
Charles (Tony) Keyes 07 Mar 2006