8 papers
Updates to WFC3/UVIS Encircled Energy Values in Select Filters
Anne O'Connor, Jennifer Mack, Varun Bajaj
We present updated encircled energy (EE) curves for a subset of UVIS filters. These are derived from a reanalysis of the drizzled Point Spread Function (PSF) data underlying the cu…
The James Webb Space Telescope Absolute Flux Calibration. VI. Near-Infrared Camera Imaging and Coronagraphy
Martha L. Boyer, Benjamin Sunnquist, Bryan Hilbert +4
We present an updated flux calibration for all imaging modes of the Near-Infrared Camera on JWST that converts instrumental units to physical surface brightness units of MJy sr^-1.…
Updates to the WFC3/IR Photometric Stability Stellar Cluster Study
Ky Huynh, Varun Bajaj
The WFC3/IR channel has been shown to lose sensitivity over time. The sensitivity loss rate has been quantified in past works and we extend those measurements into 2026 using photo…
New Time-Dependent WFC3/IR Inverse Sensitivities
Annalisa Calamida, Mariarosa Marinelli, Varun Bajaj +2
We present new time-dependent inverse sensitivities for the WFC3/IR channel. These were calculated using the sensitivity change slopes measured by \citet{2024wfc..rept....6M} and p…
WFC3/UVIS Geometric Distortion -- Time Evolution of Linear Terms w.r.t Gaia
Anne O'Connor, Varun Bajaj, Jennifer Mack +1
We align more than 7,400 WFC3/UVIS exposures to the Gaia DR3 catalog to examine the time evolution of the linear terms (shift, rotation, scale and skew) of the geometric distortion…
Pixel-Based Non-Linearity Correction for the WFC3 IR Detector
Sachindev S. Shenoy, Ky Huynh, Varun Bajaj +1
The current non-linearity correction for the Wide Field Camera 3 Infrared (WFC3/IR) channel is based on ground-based data acquired during WFC3's Thermal Vacuum 3 (TV3) testing camp…
WFC3/IR Geometric Distortion - Time Evolution of Linear Terms w.r.t. Gaia DR3
Anne O'Connor, Varun Bajaj
We examine the relative offsets of the linear terms in the geometric distortion between WFC3/IR and the Gaia DR3 catalog using the Mikulski Archive for Space Telescopes (MAST) pipe…
Updates to the WFC3/UVIS Saturation Map
Mitchell Revalski, Isabel Rivera, Varun Bajaj +1
The calwf3 software for WFC3/UVIS utilizes a reference file to flag pixels that are saturated beyond their full-well depth. Previously, this was accomplished using a constant thres…